Multipurpose Motor Treatment. Lawn mower fuel treatment

Multipurpose Motor Treatment

multipurpose, motor, treatment, lawn, mower

STP Multipurpose Motor Treatment Fuel Stabilizer does not contain water-absorbing alcohol, and helps prevent many of the negative side effects that can happen when engines sit idle for long periods of time

Product Description

  • Cars
  • Trucks
  • Boats
  • Snow blower
  • Motorcycles
  • Tractors
  • Snowmobiles
  • Outboard motors
  • Chain saws
  • Lawn mowers

Whether it’s your car, truck, boat, lawn mower, snow blower, chain saw, ATV or other motorized equipment, STP Multipurpose Motor Treatment provides regular oil and fuel system care for engines used every day and for engines used less frequently.


STP Multipurpose Motor Treatment Fuel Stabilizer does not contain water-absorbing alcohol and helps prevent many of the negative side effects that can happen when engines sit idle for long periods of time.

How it helps:

  • Stabilize fuel
  • Fight rust build-up in the fuel tank
  • Prevent oxidative degradation in the fuel
  • Fight tough cold starts
  • Prevent fuel line freeze by removing water


Great for the fuel system, crankcase, and intake, STP Multipurpose Motor Treatment Fuel Stabilizer helps:

  • Clean engine deposits and fight friction
  • Clean fuel injectors and intake valves
  • Protect against viscosity build up
  • Protect against crankcase sludge
  • Provide upper cylinder lubrication

Use regularly to protect and maintain all your gas and diesel engines.

Treat Rate: 1 bottle treats 21 gallons

Take Note!

STP Multipurpose Motor Treatment Fuel Stabilizer does not contain water-absorbing alcohol, and helps prevent many of the negative side effects that can happen when engines sit idle for long periods of time

Usage Directions

See packaging for details on usage in cars, trucks, boats, lawn mowers, snow blowers, chainsaws, ATVs or other motorized equipment.

Usage Frequency: Use regularly to protect and maintain all your gas and diesel engines.

The Best Ethanol Fuel Treatments

Unless you are granted the rare privilege of having a consistent source of ethanol-free fuel, you always need to be cautious of the possible long-term issues that ethanol will inflict on any vehicle that you own. For many people, especially Americans, it’s unavoidable, like death and taxes as the old saying goes. We get that it’s environment-friendly, but its disadvantages can be tough on the wallet.

What’s good is that there’s nothing the best ethanol fuel treatment can’t handle. From an engine misfiring, running slowly and idling to low fuel longevity, it didn’t take long for me to become a believer in the wonders of these additives and stabilizers.

Care to try them out yourself? Then, read my review of ten products that stood out to me in all the time I started using fuel treatment for ethanol below.

STA-BIL 22240

Sea Foam SF-16

  • Top 10 Ethanol Fuel Treatment Reviews
  • 1. STA-BIL 22240 Marine Ethanol Treatment
  • 2. STAR BRITE Star Tron Enzyme Fuel Treatment
  • 3. Sea Foam SF-16 Motor Treatment
  • 4. STA-BIL 22275 Ethanol Treatment
  • 5. Lucas Oil 10576 Ethanol Fuel Conditioner
  • 6. STAR BRITE Star Tron Enzyme Fuel Treatment
  • 7. LUCAS LUC10013 Fuel Treatment
  • 8. K-100 K100-G Fuel Treatment Additive
  • 9. B3C Fuel Solutions Ethanol Fuel Treatment
  • 10. Opti-mizer Ethanol Fuel Treatment Stabilizer

Top 10 Ethanol Fuel Treatment Reviews

STA-BIL 22240 Marine Ethanol Treatment

STA-BIL 360 is a top boat fuel treatment because it anticipates the average boater’s habits and addresses plenty of ethanol problems at the same time.

Despite its obvious strengths, I can’t back the brand’s claim that it makes fuel last up to a year. That being said, the most I’ve kept my vessel idle is 8 months. My STA-BIL-treated gas still managed to efficiently power my Yamaha fishing boat for a day in spite of the length of time that I chucked the rest and did a fresh, full refill. I’ll take that perk any day.

This brand will always be my go-to for keeping fuel fresh for a long time for this reason alone. That’s assuming you won’t be taking your boat out for a long period since I’ve found that it does its magic better if it isn’t disturbed every now and then.

On the whole, it works best on small engines and outboards, in my case. I also apply it to my lawnmower every once in a while to ensure it starts smoothly every time. I can also say that it works great as a fuel cleaner, since I don’t encounter any ethanol issues on all the motors that I’ve used it on.

I have only one small complaint about the bottle design. I wish I could pour it directly without the worry of any spillage occurring. I kind of hate that I sometimes have to use a syringe just to keep this from happening and to ensure accurate measurements.

  • Excellent fuel-keeping ability
  • Works best on small motors
  • Great fuel cleaner
  • Delivers most of what it promises

I’m well aware that no ethanol fuel treatment or fuel additive should be considered as a cure-all for ethanol issues. Nor can phase separation be ever assured with every use. Nonetheless, what I can say is that this product made a big difference in how I now seldom encounter the performance issues I used to have with my boat’s outboard motor and other small tools the moment I started applying this.

STAR BRITE Star Tron Enzyme Fuel Treatment

Can be used on most vehicles, cars, motorcycles, and boats, Star Tron’s versatility is only further punctuated by its myriad benefits found in ethanol treatments.

The first thing that I need to emphasize about this product is its outstanding fuel stabilizing ability. It’s way up there with STA-BIL as far as this feature is concerned. My father agrees with me on this as he uses it regularly for his Boston Whaler.

He takes it out but tends to keep it fueled for an entire year. I can attest that his boat still runs and starts well even after the fuel has stayed dormant for more than a year. It may not be two years as the brand claims but that’s still a rare feat.

over, a friend of mine used it on his pontoon boat, which he didn’t touch for a whopping three years! He couldn’t take the old gas out so he just applied this and refueled the boat with fresh 91 supreme gas. It started cleanly and worked as good as new for the entire day we spent cruising on it.

I didn’t buy the mileage-boosting claim at first having used my fair share of products that fell short in that regard. But, when I started seeing notable gradual increases in my MPG, topping at about 2.5 extra miles for my car, this became an instant favorite. I’ll take those seemingly marginal mileage jumps any day considering I never change my driving habits and the fact that it helps me save more in the long run.

To me, almost all vehicles and lawnmowers that I apply this to run better, which is a good sign that it tackles the usual ethanol issues. It’s not hard to hear the difference based on the sounds alone. For that, it already wins in value for money.

It would be perfect if it included a measuring tool of some kind. It will save me time and effort, after all.

  • Proven to boost mileage and fuel efficiency
  • Works well for a lot of vehicles
  • Remarkable fuel keeping
  • Improves engine performance
  • Well worth the money

This product’s combination of benefits is hard to top. It sets the bar high for the right ethanol treatment for boats and other vehicles.

Sea Foam SF-16 Motor Treatment

As far as an ethanol fuel additive is concerned, it’s hard to not include a product that’s been around for decades and has gained the trust of hundreds of mechanics. Sea Foam is one of the rare few that automatically earns that recognition.

Where this product is applied, ethanol issues almost always take a backseat. I use this on boats, cars, lawnmowers, and leaf blowers, especially if I have no choice but to use ethanol-laced fuel. I may not get the same stellar engine performance afterward, but I can say as much for the majority of them.

This is coming from someone who knows what poorly running engines sound like as a result of ethanol. It solves the issue right away and keeps it from coming back for good. Is it any wonder why many people stick with this product?

It works better as a fuel cleaner than a stabilizer, in my opinion. I just pour the right amount in a tankful of gas and it quickly clears up deposits in vehicles and gadgets that work well with it. But for most small engines, I admit it’s a better stabilizer because it still lets my leaf blower run smoothly after 7 months of storage.

Its only real flaw is that it doesn’t take its versatility all the way. For instance, it doesn’t work its magic on other outboard brands that I own.

  • Can be used on a variety of vehicles and home tools
  • Easy to apply most of the time
  • Protects most engines from ethanol problems
  • Excellent fuel cleaner
  • Good stabilizer for small motors

Sea Foam may not work on all engines. Nor can it always deliver some of its powerful advantages. However, many in the automotive and boating industries are without a doubt glad that there’s always this solid additive for small engines to avoid problems with ethanol readily available in the market.

STA-BIL 22275 Ethanol Treatment

With its name and brand reputation, STA-BIL 360’s special ethanol treatment solution may seem like one of those products that easily earns a spot here. Ultimately, it’s the difference it makes that seals the deal.

What exactly is that difference? To me, it’s the versatility. It addresses ethanol issues as great as Sea Foam yet still guarantees your gas won’t be rendered useless by the same chemical in less than a month. I could just as easily substitute this for the said fuel cleaner to make sure my small engines stay unblemished by ethanol.

While I can get more out of other STA-BIL products when keeping my fuel fresh for a long time, this one can still do a fine job in that it works well for gas or diesel you’ll be storing for no more than 6 months. That’s the average for all the boats and cars I’ve used it on. With that said, I feel it works best as a fuel cleaner and engine performance booster.

I have a buddy who attests that this gives him a whopping 50 miles more per fill-up, which is nothing short of outstanding. As for me, I can safely say that it does give my Subaru at least a 10 to 15-mile increase. In my boats, the MPG increase is marginal, around 3 miles at most, but I can’t complain since I rarely get this perk for my outboards with the other additives that I use.

Overall, it’s on-par with Sea Foam, and I won’t hesitate to get this if the latter isn’t available. As for other cons, I also dislike the fact that it’s pricey.

  • Above-average fuel stabilizing
  • Proven to boost mileage
  • Improves engine performance
  • Overall excellent fuel cleaner

This product is another reliable offering from a well-known brand that has its own unique mix of benefits. At least, my first-hand experiences over time outlined in this STA-BIL ethanol treatment review have revealed as much.

Lucas Oil 10576 Ethanol Fuel Conditioner

Economically priced and delivers no-nonsense results consistently, this Lucas Oil gas additive for ethanol effortlessly gets an A as a fuel system cleaner and for helping engines run the way they should.

I’ve seen the effects of this fuel conditioner on my cars, boats, a buddy’s jet ski, and other simple machines, like lawnmowers, and that should give you a good idea of its versatility. Almost all have two common denominators in their post-application results: better overall performance and smoother starts. I think that’s solid proof of how effective this is as an ethanol buster.

I use E85 gas on my cars. After cleaning and lubing the injectors with this, I noticed a marked improvement in deceleration. It’s much more responsive now after I brake and, more importantly, it took care of the bucking issue I had with my Evo X. It’s the only treatment I did for it, so I’m certain it’s the one responsible for addressing the issue.

I’ve been using this regularly for 3 years. In all that span of time, I get close to zero ethanol issues. I’m not too sure if it deserves all the credit for that, but I’m fairly sure that it’s largely responsible for these conducive results.

Unlike others who use this as an ethanol fuel stabilizer, I think it would be pushing it if I say it keeps my fuel fresh for as long as other products out there. I’d stick to cleaning and engine protection when using this conditioner.

  • Proven to work on gasoline-powered boats, cars, jet skis, and other applicable machines
  • Improves performance and helps engines start smoother
  • Budget-friendly
  • Provides active protection against ethanol damage
  • Excellent value for money

I cannot think of a more cost-effective brand that serves as an ever-reliable ethanol treatment for gas than this product. Highly recommended if your budget’s a little tight or if you have an old car that can’t handle ethanol.

STAR BRITE Star Tron Enzyme Fuel Treatment

This version of the classic Star Tron enzyme fuel treatment maxes out its protective capabilities. You expect both outstanding fuel stabilizing and long-term protection from clogs from this.

I’m going to go right ahead and say what I love about this product. It delivers what it promises. Two years of guaranteed fuel freshness. At least, I can say as much for my old fishing boat’s Mercury outboard when I had no other choice but to take a lengthy boating break after an accident broke my hip.

It started cleanly on the first pull-start. No rough idling or gumming whatsoever from the moment I left it running for 5 minutes until when I started cruising. I depleted the entire tank for one day of fishing and re-filled it with a fresh batch of fuel and poured a bit of this additive. Easy as pie usage if I may say so.

I no longer encounter any clogging issues in the majority of my small engines if I apply this to them. If that isn’t a hallmark of a far superior, if not ideal, fuel stabilizer and cleaner then I don’t know what is. This stuff won’t restore old fuel but it clears gunk and keeps any fuel you treat with it as good as the day you bought it.

I’m not praising its price tag anytime soon, though. Also, I admit there is a minor con in that this product only works best on small engines.

  • Keeps fuel fresh for a long time
  • Easy usage
  • Great in addressing idling and gumming problems
  • Protects from clogs
  • Removes buildups

I’m of the opinion that this trumps STA-BIL in fuel stabilizing, and I bet I’m not the only one who thinks so. I’d easily choose this over that brand if I’m aiming for a year or two of storage.

LUCAS LUC10013 Fuel Treatment

LUCAS fuel treatment is one of those products that have a well-founded reputation for delivering the results it promises. To me, it’s as simple as getting that much-needed peace of mind with an ounce of this ethanol treatment for every 5 gallons of fuel.

There’s a low but still noticeable MPG increase of, on average, 1 extra mile when I use it on most of my land vehicles, which happens to be a Toyota Tundra and another family pickup. Both already have plenty of mileage and are a bit on the old side. That being said, I think it benefits cars with older engines, at least 10 years ago or more.

This is because a workmate of mine who owns a 2016 Camry said that he tried it out but didn’t notice any notable improvements. Others report getting up to 10% of fuel economy, which I bet is very much plausible. I’m going to have to try it out on other diesel and gas-powered vehicles to know.

I continue to use it as a way to repel fuel injector problems and keep the engine running good as new. That’s adequate considering it’s obvious that I’m only extending the life of the engine in general. I can’t say as much for the majority of other fuel treatments I’ve tried.

With my ratio of application, I’m basically getting remarkable 8 to 10% cost savings in fuel alone, and that’s not considering the protection that essential parts like injectors and fuel pumps enjoy. I’m sure that I’m saving a lot since these parts are prone to wear and tear courtesy of everyone’s good, old buddy ethanol.

  • Decent mileage and fuel economy improvements
  • Ideal for preventive maintenance
  • Cost-effective and great value for money
  • Keeps gas and diesel engine running at peak condition

For older cars, this fuel treatment is a godsend. Overall, it’s great for motors that can’t handle ethanol well.

K-100 K100-G Fuel Treatment Additive

Ideal for phase separation and as a fuel cleaner, almost anyone who tries out K-100 would undoubtedly discover how much of a gem it is.

I’ve tried this out on a Yamaha outboard, lawnmowers, snowblowers, and the only motorcycle I own. While I’d refute the brand’s claim that it “eliminates water”, I can say that this is one of the top-tier fuel treatments for phase separation issues. After all, it doesn’t eliminate water as much as it aids the engine in burning it off.

The mileage boosts I get from it is what ultimately convinced me of how terrific this product is. I can report as much as 30 extra miles with an application of 10 ounces per 20 gallons. That’s the exact capacity of my 2008 Infiniti, and all I can say is that the mileage meter doesn’t lie.

I can also say the same for the motorbike that I use, especially if it guzzles down ethanol-rich fuel regularly. It gives me at least 10 additional miles and the motor sounds like music to my ears every time I take it out for a ride. Not really much of a biker, but it makes a clear difference in my opinion.

As for my outboard, I’m glad it took care of a lingering starting problem it had. It starts alright but the motor dies after about 15 seconds. I tried K-100 on it and let it sit overnight. The next day I gave it the old pull-start, and the issue never reared its ugly head from then.

However, it has a quite lofty price tag. Also, I wish it made life easier for bikers, who happen to be its regular users, by including a funnel for easier pouring.

  • Best for addressing phase separation
  • Remarkable mileage boosts in cars and motorcycles
  • Improves engine
  • Versatile

Your standard ethanol additive in gasoline can rarely match the mileage boosts imparted by this fuel cleaner. To me, it’s already a winner with that sole benefit.

B3C Fuel Solutions Ethanol Fuel Treatment

Any product that can confidently state that it functions as a “Mechanic in a Bottle” can readily turn a lot of heads. Considering my positive experience with it, I can attest that it walks the talk.

It wonderfully serves as a solid solution to the 2-stroke and 4-stroke outboard problems that I usually get. Sure, there’s always Sea Foam that can almost magically dispel those idlings and sputterings. Even so, this is a neat alternative to have, especially if stocks are running short. You can always rely on this treatment for your ethanol issues.

I won’t hesitate to use this on anything with a carburetor, as long as its fuel is compatible, that is. It took care of a clogged carburetor issue that my generator has been having for a good portion of a year, and this was the first fuel cleaner that I used which effectively cleared up the buildup. I’m glad to share that the generator’s running in tip-top shape now.

Almost any vehicle or machine that has sat idle for a long time should, at least, be given this before use. I can compare the performance of my untreated and treated snowblower. The former’s is atrocious, to say the least.

Considering the price, bottle contents, and the recommended doses per gallon of this product, it’s quite costly. Still, I get what I pay for so it’s a better deal than treatments from other lesser-known brands.

  • Suitable for outboard motors and generators
  • Solves sputtering, idling, and rough starts
  • Cleans carburetor buildups
  • Great for restoring the performance of small engines

Opti-mizer Ethanol Fuel Treatment Stabilizer

I feel that this stabilizer isn’t getting the recognition it deserves. It works great on 4-stroke motors, and if you’ve been having a hard time looking for an ethanol fuel treatment for those types of engines, I highly recommend you give this a try.

I’ve tried this fuel treatment out on Mercury 2-stroke outboards, a Yamaha 4-stroke outboard, a riding mower, and an ATV. I can say that I get the best results in 4-stroke engines. By best, I mean that it keeps the engine running cleanly and almost as good as new.

This advantage isn’t as pronounced in the other motors and vehicles that I mentioned. However, the fact that I don’t encounter the usual tell-tale signs when starting them serves as a good hint that it’s at least exerting a positive effect to some degree. I think it’s a great carburetor cleaner for this reason.

I’ve used this to keep the fuel of my riding mower and boats fresh when I won’t be using them over the winter. The longest I’ve kept them idle is 6 months, but I bet it keeps fuel from going stale for longer than that. My 4-strokes don’t cold start and display any of the common snags and slipups once I started using it on them.

The 4-stroke limitation serves as my main gripe with this fuel stabilizer. I understand that they have a separate product for it, but a lot of brands manage to formulate a fuel stabilizer for ethanol gas that can accommodate both 2-strokes and 4-strokes. It’s not cost-effective if you have other engines to treat.

  • Proven to work great on 4-stroke engines
  • Keeps fuel fresh for more than 6 months
  • Cleans carburetors
  • Shows active protection against ethanol

Its FOCUS on small 4-stroke motors alone imparts this Opti-mizer’s value. I challenge you to name other brands that can deliver the same results for the said motor type.

Buyer’s Guide

Ethanol fuel treatments and fuel stabilizers are sometimes used interchangeably, but in essence, they may differ in their purpose. You have to know what these differences are before deciding to choose which product to buy.

Essentially, ethanol fuel treatments are types of fuel stabilizers that lean more toward engine performance rather than fuel storage. It’s more about prolonging the engine’s life than keeping fuel at its best. But, that doesn’t mean that they’re entirely devoid of benefits related to fuel longevity. Brands formulate their solutions with overlapping advantages in mind, after all.

It’s simply logical for you to opt for products that solve that particular problem. Specificity and compatibility, therefore, should be your main priorities. You should aim, for example, to choose products marketed as an ethanol gas treatment for small engines then read the user feedback about it.

Key signs of good ethanol treatments include excellent fuel system cleaning and notable engine performance boosts. It should be able to take care of phase separation and break down buildups of sludge that spell ethanol damage for most engines.

Be mindful of the types of fuel and motor each product is compatible with. Whether it’s E85, E10, or other diesel and gasoline available, you should ask the manufacturer about its suitability. Even the age of your motor should be considered.

Unless you’re switching from ethanol to non-ethanol, knowing what ethanol treatment to use would only do your engine and your wallet a load of good.

What is the Top-Rated Ethanol Fuel Treatment

To me, STA-BIL, Sea Foam, and Star Tron are the no-brainer options. Star Tron’s specially-formulated Enzyme Fuel Treatment tackles ethanol fuel issues head-on, and it has hundreds of satisfied customers who can back up its claims. The other two are also go-to options for addressing many ethanol problems, besides imparting a host of other benefits.

Even if I highlighted those three, I wouldn’t sleep on the other brands and products featured here. They’ve delivered satisfactory results in beating ethanol, even though they’re not as well-known.

How Do Ethanol Fuel Problems Affect the Fuel System

You don’t need to look further than the term “phase separation” to know how ethanol damages engines and motors. Ethanol tends to absorb the water naturally found in gasoline and diesel. This results in the said separation in the ethanol-water mix.

Any fuel that has completely undergone phase separation has a higher chance of damaging integral parts of the engine and fuel system, like the carburetors and injectors, to cite a few. If this is the case, the fuel would be unusable and would have to be drained to keep the fuel system running.

Other issues include nasty corrosion of the said parts and significant reduction of the motor’s lifespan. Another prevalent issue is clogged fuel systems, besides gasoline turning into varnish.

Does Ethanol Fuel Treatment Work

Yes, and the products listed here stand out in doing just that. Most are able to achieve this effect by either absorbing the water or inducing it to be burned off before phase separation can occur. In the end, as long as these products prevent phase separation, ethanol damage doesn’t start.

Does Sea Foam Stabilize Ethanol Fuel

It will always provide a certain degree of protection against ethanol, but I can’t say that this applies to all types and ages of engines. In other words, don’t expect Sea Foam to be a cure-all for ethanol issues.

With that said, is Sea Foam a good fuel stabilizer? Overall, it is, especially if you want to remedy ethanol problems. However, it wouldn’t be as satisfactory in keeping your fuel viable for a long time.


Do you now have a clear image of the best ethanol fuel treatment? Based on my experience, it’s any product that keeps engines running as they should. In short, it should work. I can back the numerous claims of other satisfied users, having done some trial-and-error myself. I hope that with this guide, you won’t have to take too much time and effort to discover what works for you.

The Best Fuel Stabilizer, According to 11,300 Customer Reviews

Welcome to the Thomas guide to the best fuel stabilizer 2023. Thomas has been connecting North American industrial buyers and suppliers for more than 120 years. When you purchase products through our independent recommendations, we may earn an affiliate commission.

Starting up cars, trucks, or other engines that haven’t been used in quite some time can lead to fears of corroded parts, deflated tires, and fuel that has gone bad. The most troublesome is often how the fuel has held up, but fortunately, there is a category of products that can bring fuel back from its gummy, gelled-over state of being.

multipurpose, motor, treatment, lawn, mower

Fuel stabilizers are hailed for their ability to preserve gas that’s been sitting for a long time. They’re all similar in how they work, but some are made specifically for different fuel types, engines, seasons, and detailed problems. Here’s a brief synopsis of how they work, what they affect, and some of the best fuel stabilizers on the market.

How Fuel Stabilizers Work

If collector cars, or any vehicles or tools, including power machines like blowers, mowers, boats, or generators, haven’t been used in a while, fuel can start to degrade and separate. Stored fuel, whether it’s kept in storage containers or left sitting in the fuel tanks themselves, can degrade and become contaminated with things like excess water over time.

When left too long, the entire fuel system can be damaged and parts can get clogged or jammed up. To prevent this from happening, it’s best to add a stabilizer to the fuel prior to letting the vehicle or machine sit. Any machine that is destined to go unused for three months or longer should have a stabilizer added to the tank with the fresh fuel.

Both systems that use ethanol fuel and diesel fuel can benefit from a fuel stabilizer, but it’s best to ensure the product being considered is compatible before buying or using. There are also specialized marine fuel stabilizer options that are best suited for marine engines. It should go without saying, but always read the label prior to buying.

Do Fuel Stabilizers Affect Fuel Economy?

There is a common misconception that fuel stabilizers can improve fuel economy (aka fuel efficiency). Fuel stabilizers can keep fuel in a useable state, but they don’t have the power to make gas or your vehicle’s fuel system more efficient—in fact, no fuel additive really can. Fuel economy is based on the vehicle’s makeup and construction. It may affect gas mileage in a roundabout way as it can clear up blocks and sludgy fuel.

For cars and trucks struggling with fuel economy or having overall gas mileage trouble, it’s best to see a technician, mechanic, or another professional who can diagnose the problem. Proper maintenance in tandem with a good stabilizer prevents ethanol fuel problems (and diesel) down the road.

Do Fuel Stabilizers Affect Fuel Injectors and Fuel Systems?

Fuel stabilizers can positively affect fuel injectors and other parts of the system in two ways mainly. Firstly, by preventing old gas from degrading, gelling, or gumming up, they indirectly relate to healthier, functioning parts and thus better engine performance.

Secondly, some stabilizers can help lubricate and clean the inner workings of an injector or fuel tank. Rarely do they negatively impact engines and fuel tanks, but be aware of the type of fuel stabilizer being used, how old the gas is, and how much is being poured in to avoid too much fuel stabilizer.

Here is a list of the best fuel stabilizers, followed by a buying guide to help you select the best fuel stabilizer for your needs.

Thomas’ Top Picks for the Best Fuel Stabilizer 2023

The following fuel treatment options are rated highly by customers and will help stale fuel from ruining machines, vehicles, and other powered items.

Best Fuel Treatment for Motorcycles: Lucas Oil 10303 Fuel Stabilizer | Buy Now

Best Engine Restart Formula: Start Your Engines! Fuel System Revitalizer | Buy Now

Best for Diesel Engines: STA-BIL Diesel Fuel Stabilizer | Buy Now

Scroll down to see our top picks for the best fuel stabilizer according to happy buyers.

listed in this article were as shown in US on (USA) and other retailers as of November 2022

Best Overall Fuel Stabilizer—STA-BIL 360 Protection Ethanol Treatment Fuel Stabilizer

With this STA-BIL fuel stabilizer added to a gas tank, stored gas will stay good for up to a year and gasoline engines will therefore be protected from sludge and corrosion.

The formula itself can last for up to two years and is a viable additive for everything from cars to generators to lawnmowers. For best results, it’s important to add STA-BIL prior to filling up a tank at a gas station or a gas storage container so it mixes properly.

“I have used it before with great results so I bought more for this upcoming winter weather,” explained a customer. “Using on an HD Motorcycle and two Yamaha Waverunners for the third year straight, and have never had issues with bad fuel when it comes time to pull them out of storage.”

Fuel type: Ethanol and non-ethanol blends

Amount: 32 fl. oz.

Gallons of fuel treated: up to 160

Best Fuel Stabilizer for Cleaning and Stabilizing—Star Tron Enzyme Fuel Treatment Concentrate

Star Tron’s Enzyme fuel treatment is more than just a fuel stabilizer. It’s made to clean out a fuel system and keep the fuel tank, gasoline engines, and injectors in tip-top shape.

It functions by decomposing contaminants into tiny particles, which are then removed when the engine burns fuel again. Any stress over an accidental heavy pour can dissipate, too, as systems can’t be overloaded or overdose with this formula.

“It especially works great for all engines that may sit for quite some time between uses, it keeps the gas from separating and varnishing,” described a customer. “I use it extensively in my 2-cycle engines to keep the small hoses soft for years—I typically get 2–3 years out of my trimmer fuel lines now as compared to 8–12 months without.”

Fuel type: Ethanol fuel

Amount: 128 oz.

Gallons of fuel treated: 2,048

Best Outdoor Power Equipment Fuel Stabilizer—Yamaha Yamalube ACC-FSTAB-PL-32 Fuel Stabilizer Conditioner

Gasoline engines that tend to sit around most are those in power tools and generators. Many lay inactive for seasons unused until they’re needed again, and to keep fuel fresh, Yamaha made Yamalube, an alcohol-free formula that’s superb for small engine equipment.

This is suitable for two- and four-stroke engines, whether it’s being used in a leaf blower, chainsaw, or trimmer. A handful of reviewers found this stabilizes fuel in boats successfully as well as Waverunners (and other watercraft).

“I can attest that this stuff was in the fuel tank of an older riding lawnmower, that was stored outside, for five months during the winter,” wrote a buyer. “Rain, snow, freezing weather, and then some hot weather as spring came. The lawnmower started right up. Perfect. No long cranking, no chugging. I didn’t even top-off the battery first.”

Fuel type: E10 ethanol

Amount: 32 oz.

Gallons of fuel treated: 96 gallons

Best Fuel Treatment for Motorcycles—Lucas Fuel Stabilizer

This Lucas fuel stabilizer is great for a variety of gasoline engines, but many reviewers rave about it when it’s used to store fuel for and in motorcycles. The alcohol-free formula performs well in both two- and four-cycle engines.

When mixed with fuel (fresh) it prevents it from degrading and won’t harm injectors or carburetors. Lucas also sells it in five and 55 gallon containers for businesses or mechanics that may need more than standard.

“Have a Harley with fuel injection that I sent to the UK,” began a reviewer. “It took over seven weeks to arrive and it cranked up the first time and ran with no problems. Love this stuff for long-term periods of time sitting without cranking up.”

Fuel type: All grades of gas

Amount: 32 fl. oz.

Gallons of fuel treated: 32 gallons

Best Long-Lasting Fuel Stabilizer—B3C Fuel Solutions Ethanol Shield Stabilizer

Most fuel stabilizer options stabilize fuel for up to a year or two years, but B3C’s stabilize fuel for three, really extending the life of fresh fuel. This strong formula has two additional components: antioxidants and a corrosion prevention system that works with all metals.

Some engines may also need higher octane fuel as they get older—this stabilizer is made to prevent that. And its lubricating texture is helpful for the functioning of upper cylinders.

“This is the best stabilizer I have used,” began a customer. “Had put it in my Honda power washer four years ago and finally had a real purpose to get it out again and I figured on rebuilding the carburetor. No way she started up on the first pull couldn’t believe it.”

Fuel type: Ethanol-based gasoline

Amount: 24 oz.

Gallons treated: 240 gallons

Best for Worn Down Power Tools—STA-BIL Fast Fix Small Engine Treatment

A smaller fuel system will get a lot from this fast-acting STA-BIL fuel stabilizer. Its size of it makes it an ideal portion for toolboxes and back-ups in garages. It works best in the gas tank of smaller machines like mowers, blowers, throwers, and generators.

This is a great antidote for rough idling engines, too, and prevents corrosion once it’s added to a fuel system. That being said, like any fuel stabilizer, it won’t fix old fuel. New gas will need to be added to a machine that’s not operating smoothly. That being said, it’s key for obliterating carbon deposits and gummy residue.

Many of the reviews emphasize how well it works with similar success stories of old machines getting a new life. “I had a snowblower that would never start for several years,” wrote a customer. “After using this product it started it right up and it has been running ever since.”

Fuel type: Ethanol blends

Amount: 4 Fl oz.

Gallons treated: 20 gallons

Best All-in-One Fuel Stabilizer—Royal Purple Max-Clean Fuel System Cleaner and Stabilizer

Royal Purple’s fuel stabilizer is actually three products in one. When it seeps through a fuel system (compatible with both gasoline and diesel engines), it helps keep fuel fresh, cleans out the components, and prevents rough, inconsistent idling.

It’s best suited for use in cars (2 or 4 cylinder) every 10,000 miles, but it’s just as capable of being used in fuel that’ll be stored for some time.

“I’ve been using this Royal Purple fuel system cleaner for years now and I’m very satisfied,” wrote one contributor. “My 14-year-old truck runs like new and I know this is a contributing factor.”

Fuel type: Ethanol blends

Amount: Two 20 oz. bottles

Gallons treated: 1 bottle per tank of gasoline (fresh)

Best Engine Restart Formula—Start Your Engines! Fuel System Revitalizer, Pack of 8

This isn’t a fuel stabilizer, per se, but it fits neatly in a similar realm. The STA-BIL revitalizer is meant for machines that are far past the point of stable fuel and may have engines that no longer run or start properly.

Like a fuel stabilizer, it’s capable of eating away at gummy, globby fuel, but it’s not primed to prevent degradation and keep fuel fresh for extended periods of time. After a thrower or mower has been dormant for some time, this can be sprayed directly into the tank to support start-up.

“I have an older Craftsman lawn mower up at a mountain cabin that sits for periods of time and is very stubborn to start—even cleaning the carburetor did not really help,” explained a reviewer. “I was going to trash it and buy a new one so I thought I’d try this stuff… The mower started on the second pull of the cord and ran like a champ. VERY happy with this purchase.”

Fuel type: Ethanol

Amount: Eight-pack of 2 fl. oz. each

Gallons treated: 1 can per fuel tank

Best for Diesel Engines—STA-BIL Diesel Fuel Stabilizer

Gasoline and diesel engines both require stabilizers if they sit for long periods of time. Diesel vehicles and tools that need old fuel to stay in working condition will get their money’s worth from STA-BIL’s diesel-specific version.

Aside from the general degradation of gas, this prevents diesel from getting dark and going bad. Similar to others, it’s equally as protective from corrosion, buildup, and sediment, too. Some stabilizers are fine when overused, but the same can’t be said for this one—just be cautious when reading measurements.

“I have used this product for over 30 years and year in and year out never had a fuel problem in the spring,” wrote a customer who uses it over winters. “I have used the gas stabilizer and the diesel stabilizer. Easy instructions for ratio-to-fuel in-boat.”

Fuel type: Diesel

Amount: 32 oz.

Gallons treated: 320 gallons

The Best Fuel Stabilizers 2023—Summary

Old gasoline can be saved for up to one year or more depending on the fuel stabilizer that’s added to old fuel. Professionals and car enthusiasts alike will appreciate the money, energy, and annoyance these products save and how much they can affect an engine’s power and start-up, and lead to less fuel waste.

To prevent phase separation or fuel oxidation in ethanol-blended fuel in a gasoline engine, B3C’s stabilizer (US27.99, Amazon) is a solid choice. A diesel engine on the other hand will appreciate the STA-BIL Diesel Fuel Stabilizer (US28.99, West Marine) fuel additive. To keep the fuel line healthy on a smaller machine, STA-BIL Fast Fix (US11.99, Amazon) is a worthy consideration.

Choosing the Best Fuel Stabilizer—Buying Guide

To prevent having to drain fuel or bad fuel from ruining an engine, fuel stabilization is key. By adding a fuel stabilizer, treated fuel can last longer and stay safe sitting dormant. But not all fuel stabilizers are created equal—here are several top products that are worth looking into.

We hope our review of the best fuel stabilizers has been helpful. For more suppliers of related products, including stabilizers, diesel fuel additives, and fuel oil conditioners consult our additional guides, or visit the Thomas Supplier Discovery Platform.

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Use Sea Foam Fuel Additive in a Lawn Mower to Stabilize Fuel

You’ve probably been stuck trying to start your mower the following mowing season only to find out it won’t start.

A big culprit to mowers not starting after sitting a while is stale gasoline. Gasoline does not have a long shelf life and needs to be used within 30 days unless you add a fuel stabilizer.

Sea Foam fuel stabilizer can be used in any gas or diesel combustible engine and fuel system. Sea Foam is a petroleum-based product without harsh chemicals making it safe to use in your engine or fuel system.

Below, we’ll cover how Sea Foam can help a mower’s motor and fuel system, as well as whether or not the solution should be used with your lawn mower and how much you should use.

This post may include affiliate links. Purchases made through these links may provide a commission for us, at no extra cost to you. As an Amazon Associate, we earn from qualifying purchases.

Follow all safety instructions provided in your equipment operator’s manual before diagnosing, repairing, or operating. Consult a professional if you don’t have the skills, or knowledge or are not in the condition to perform the repair safely.

Can You Use Sea Foam Fuel Additive in a Lawn Mower?

Sea Foam is a brand of fuel additive; Some of the improvements you can expect to see by using a Sea Foam product could be:

  • Reduced moisture in the fuel
  • Stabilizes fuel for up to two years
  • Cleans carburetor liquifying deposits and residues built up on needles, seats, and float bowls.
  • Improved performance
  • Cleans intake valves

In addition to cleaning the built-up deposits and dirt from your combustion engines, using Sea Foam as a fuel additive has been shown to has also been shown to improve performance and extend the overall lifespan of engines.

Sea Foam has been on the market for over 70 years. Sea Foam is a petroleum-based product so you do not have to worry about the solution damaging your mower’s engine; it’s designed to prolong your motor’s life.

Why Use Sea Foam in a Lawn Mower?

Sea Foam stabilizes fuel for up to two years. There are three reasons why you would want to use an additive like Sea Foam in your lawn mower.

  • Valve Seat Erosion: The valves of a combustion engine open and close to allow air into the cylinders and the exhaust to exit the cylinders. Over time this can become damaged and eroded by built-up particulates and debris. Sea Foam helps clean and remove this debris, ultimately extending the life of the valves.
  • Damaging Effects of Ethanol: In addition to debris and particulates from the air intake, the ethanol present in modern-day gasoline carries corrosive properties.

How to Use Sea Foam on Lawn Mowers

One of the problems gasoline has is that it leaves behind a gummy corrosive residue that can cause blockages and drain the performance of your engine (see above).

This residue is worsened if left sitting for long periods, during the winter season, for example. So, in these instances, a fuel system cleaner can help.

A 16-ounce can of Sea Foam can treat up to 16 gallons of fuel. Generally, to use as a fuel system cleaner and stabilizer on your lawn mower:

  • Fill a 1-gallon gas can with 1 gallon of gas.
  • Then add the appropriate amount of cleaner to the can– 2 ounces for every gallon when cleaning your fuel tank. Using more than 2 ounces is okay. The more you use, the better the solution cleans.– 1 ounce for every gallon when used as regular fuel maintenance

I recommend using Sea Foam in each tank of fuel.

Can You Use Fuel System Cleaner in a Lawn Mower?

A gas-powered lawn mower operates the same as any other gasoline-powered engine. As the engine is running, various dirt particles will enter into the mix through the air intake.

You can clean this the hard way by manually taking the engine apart to clean it, or the expensive way by taking it to a professional to do so. But the easiest way to clean out this excess debris is by using a fuel system cleaner.

Fuel system cleaners like Sea Foam remove this excess dirt and debris that accumulates in the engine over time. Keeping the engine clean keeps the fuel itself clean, which improves the performance of the engine.

Solutions You Shouldn’t Use on Lawn Mowers

Although many fuel system cleaners can be safely used with a lawn mower, there are a few solutions that shouldn’t be used at all. Here is a product that is not recommended to be used with a lawn mower:

  • Any Additive Targeting a Diesel Engine: This includes Diesel System Cleaner and a Diesel Emissions Reducer. Avoid these solutions if you own a gas or petrol-powered lawn mower.

Other Fuel System Cleaners That Work on Lawn Mowers

While Sea is perfectly safe and effective to use for your lawn mower (and any combustion engine for that matter), there are a few alternatives that you could consider as well:

  • Archoil AR 6200: Archoil is mainly intended for diesel engines but can be used with gas engines too. It acts as a stabilizer as well as a detergent.
  • Lucas Safeguard Ethanol Fuel Conditioner: This is an older product that acts as a lubricant and a detergent to help combat the natural deposit build-up caused by ethanol.
  • STA-BIL Original: This is again an older product. It’s primarily a fuel stabilizer that can, again, extend the life of fuel for up to two years. It’s also a well-rounded product that helps prevent corrosion and remove water build-up, but with the increased adoption of ethanol fuels, its effectiveness has waned compared to a competitor like Seafoam.

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