7 Best Fuel Stabilizers of 2021

by Joshua Thomas

Engine fuel contains volatile compounds which evaporate and get oxidized when the fuel sits for too long. In that case, the oxidation creates new compounds which can cause damage to your engine.

Therefore, it is important to look for a solution that prevents fuel degradation, with the most reliable one being the use of the best fuel stabilizers. Basically, a fuel stabilizer is a chemical compound that reduces oxidation in fuel so that it stays fresh and clean for longer.

Even after years of storage, a good fuel stabilizer should keep the fuel fresh, and with so many of them to choose from, we review the best performing ones in the market and provide a buying guide for easy selection.

Top Fuel Stabilizers of 2021 by Editors

Top Fuel Stabilizers of 2021 by Editors
Top Fuel Stabilizers of 2021 by Editors

Summary of 7 Best Fuel Stabilizers

Star Brite Concentrated 093016SS
Star Brite Concentrated 093016SS
1. Star Brite Concentrated 093016SS(Best Overall)
  • Works with all engine and fuel types
  • Up to 2 years fuel stabilization
  • Economical concentrated formula
  • Improved fuel economy and reduced emission
Sta-Bil 22214 Fuel Stabilizer
Sta-Bil 22214 Fuel Stabilizer
2. Sta-Bil 22214(Best for the Money)
  • More budget friendly
  • Ideal for both 2 and 4 cycle engines
  • Ensures quick and easy starts
  • Eliminates need for fuel drain before storage

Briggs & Stratton 100119 Fuel Stabilizer
Briggs & Stratton 100119 Fuel Stabilizer
3. Briggs & Stratton 100119A(Best for Small Engine)
  • Perfect formulation for small engines
  • 3-year protection
  • More concentrated formula
  • Special corrosion inhibitors
PRI Fuel Stablizier For Gasoline
PRI Fuel Stablizier For Gasoline
4. PRI 16G(Best Gas Stabilizer)
  • Provides a complete gasoline treatment
  • Improves fuel efficiency
  • Can be used in 2 and 4 stroke engines
  • One bottle treats up to 256 gallons
Royal Purple 11722 Max-Clean Fuel Stabilizer
Royal Purple 11722 Max-Clean Fuel Stabilizer
5. Royal Purple 11722(Best for Motorcycle)
  • Highly effective formulation for motorcycles
  • 3-in-1 formulation
  • Ideal for both gasoline and diesel engines
  • Eliminates buildup and deposits
Sta-Bil 22275
Sta-Bil 22275
6. Sta-Bil 22275 (Best for Ethanol)
  • Prevents ethanol fuel-related damage
  • Increases engine efficiency and power
  • Prevent corrosion and cleans fuel system
  • Effective on other non-ethanol blended fuels
Sentry New Technology Fuel Treatment
Sentry New Technology Fuel Treatment
7. Sentry Fuel Treatments GTPQRT32 (Water-Eliminating Formulation)
  • Eliminates water in fuel
  • Adaptive hydrocarbon technologies
  • Stabilizes and restores fuel
  • Boosts engine power and increases mileage

1. Star Brite Concentrated 093016SS - Best Overall

Star Brite Concentrated 093016SS
Star Brite Concentrated 093016SS

Star Brite Concentrated 093016SS is our best overall fuel stabilizer thanks to the fact that it cannot only work for any fuel and engine type, but is also good for both daily and long term use, and it can keep the fuel stable up to 2 years.

With the more concentrated formula, this is also a more economical fuel stabilizer, as a little of it goes a long way.

This product will clean the fuel injectors and valves, while also getting rid of things like carbon deposits, varnish and gums. In turn, this helps to improve the overall performance of the vehicle, reduces emissions and also boosts the fuel efficiency.

Given the bottle design, pouring this fuel stabilizer can be a little troublesome. But using a funnel should fix this small issue, and it should hence not be a big concern.


  • Suitable for any engine or fuel type
  • Works well for both everyday use and long storage
  • More economical to use
  • Can stabilize fuel up to 2 years
  • Significant fuel economy improvement


  • A little troublesome to pour

2. Sta-Bil 22214 - Best for the Money

Sta-Bil 22214 Fuel Stabilizer
Sta-Bil 22214 Fuel Stabilizer

Sta-Bil brings you this affordable 22214 fuel stabilizer to ensure that you get great value for your hard-earned bucks.

The stabilizer eliminates the need to drain the fuel from your 2 or 4 cycle engines since it removes water to get rid of corrosion, and also cleanses fuel injectors and carburetors.

It is a good quality fuel stabilizer that is effective on gasoline and ethanol fuel blends. And it can keep the fuel stable for up to an impressive 24 months.

This product is also compatible with marine personal craft and also works superbly for collector cars, lawn mowers, generators and snow blowers, etc.

Moreover, it is an incredible product that protects the engine from rust, corrosion, gum, and varnish, etc. so as to maintain the engine and make start ups quick easy.

Besides this 32-ounce bottle, you can also get this fuel stabilizer in other options from 4 oz to 1 gallon to cater to every motorist.

For those that use diesel fuel, this will not be an ideal product. But, this should not be a drawback as it not only does an amazing job for gasoline engines, but the brand also has other options for diesel fuel like Sta-Bil 22254.


  • Relatively affordable
  • Will work for 2 and 4 cycle engines
  • No need to drain fuel before storage when using it
  • Prevents varnish build up
  • Ensures quick and easy start


  • Not suitable for diesel fuel

3. Briggs & Stratton 100119A - Best for Small Engine

Briggs & Stratton 100119 Fuel Stabilizer
Briggs & Stratton 100119 Fuel Stabilizer

Briggs and Stratton is well known for making small gasoline engines such as those found in lawn mowers and pumps, and this means that they have perfected this product stabilizing gas in such engines.

Besides lawnmowers, you can use this product in gas pressure washers, snowblowers, small pumps, and other small gas engine powered equipment, and this makes it one of the best fuel stabilizers for small engines.

The stabilizer contains an advanced concentrated formula that also treats fuel, and provides triple antioxidant protection to keep the fuel fresh and free of water molecules.

Another important benefit with this product is that the small 16-ounce bottle is capable of treating up to 80 gallons of fuel, and keeps it fresh for up to 3 years.

In this entire duration, the stabilizer guards all metal engine components from corrosion and rust, while cleaning the fuel systems in both 2 and 4 cycle gasoline engines.

This fuel stabilizer will also not be ideal for use on diesel fuel. However, this will hardly be an issue given that most of the engines that it is meant for use gasoline.

Briggs & Stratton also has several other fantastic fuel stabilizer options like the Briggs & Stratton 100118 that will also do a fantastic job.


  • Great for small engines
  • The more concentrated formula saves you cash
  • Provides triple antioxidant protection
  • Stabilizes fuel for up to 3 years
  • Contains special corrosion inhibitors


  • Cannot be used on diesel fuel

4. PRI 16G - Best Gas Stabilizer

PRI Fuel Stablizier For Gasoline
PRI Fuel Stablizier For Gasoline

PRI's fuel stabilizer is the best for gas because it offers a complete gasoline treatment, while also being an efficient stabilizer for fuel storage. On top of this, it can be used with all 2 and 4 stroke gas engines, making it highly compatible.

The stabilizer assures smooth, easy and quick start-up whilst delivering efficient and uninterrupted operations in the engine.

Coming in as a 16-ounce bottle, the stabilizer can be used to treat up to 256 gallons of gasoline, which implies the ratio of 1 ounce to 16 gallons.

Other features include an increase in power output, improved fuel efficiency, and prevention of the formation of damaging deposits over time.

Given the bottle design, the fuel stabilizer is more prone to spilling when on storage. Hence, you need to take extra precautions with the storage if you do not use it.


  • Provides a complete gasoline treatment
  • Can be used in 2 and 4 stroke gas engines
  • Improves fuel efficiency
  • Prevents the formation of damaging deposits
  • A single bottle goes a long way


  • Spills easily

5. Royal Purple 11722 - Best for Motorcycle

Royal Purple 11722 Max-Clean Fuel Stabilizer
Royal Purple 11722 Max-Clean Fuel Stabilizer

This 11722 from Royal Purple takes the title of the best fuel stabilizer for motorcycle because, its potent 3-in-1 will be highly effective at stabilizing motorcycle fuel regardless of the type.

These 3 functions include restoring and improving the fuel economy at an average of 3.2 percent, horsepower increment on an average of 2.6 percent and lastly, a reduction in hydrocarbon and other emissions.

It is compatible with both diesel and gas engines, as well as all ethanol blended fuels. Additionally, the unit can work with 2 and 4 stroke engines, making it practically ideal for all kinds of engines in the market.

The 11722 also prevents stalling, hesitation, rough idle and premature spark plug fouling, which can otherwise cause harm to the engine.

On the downside, the 20-ounce stabilizer can only be used to treat 20 gallons of fuel. But, for its price this is still quite good, and this is more so if you will be using it for motorcycles.


  • Very ideal for motorcycles
  • Improves fuel economy
  • Reduces carbon monoxide, and other emissions
  • Increases the engine's output


  • Small ratio of 1 ounce per gallon of fuel

6. Sta-Bil 22275 - Best for Ethanol

Sta-Bil 22275
Sta-Bil 22275

For those that have ethanol engines, Sta-Bil 22275 is unbeatable as it is specially formulated to deal with and prevent ethanol-related engine damages and problems.

This fuel stabilizer will ensure that the ethanol blended fuels do not cause any corrosion, and it will allow fuel to sit on the vehicle for a long time without going bad or causing engine issues.

The formulation allows it to give the fuel system a thorough cleanup and also increases the engine's overall power and fuel efficiency.

Despite being formulated for ethanol fuels, this is still an effective product for use on non-ethanol fuel blends.

Although the fuel stabilizer to fuel ratio is not as good as others on our list, the fact that 1-ounce can treat 5 gallons of fuel means that this 32-ounce bottle is enough to treat more than 150 gallons of fuel. For many users, this is more than enough.


  • Effective treatment for ethanol
  • Increases engine power and gas mileage
  • Improves fuel economy
  • Cleans up the fuel system
  • Also suitable for non-ethanol blended fuels


  • Product to fuel ration could be better

7. Sentry Fuel Treatments GTPQRT32 - Water-Eliminating Formulation

Sentry New Technology Fuel Treatment
Sentry New Technology Fuel Treatment

Sentry's GTPQRT32 is formulated to eliminate water in fuel, hence preventing the different problems that can occur due to having water in your fuel.

The product is one of the best marine application options because it turns the most damaging elements in all fuel systems into beneficial components.

It has a unique adaptive hydrocarbon technology that helps convert water into a combustible liquid to eliminate the chances of rust or even microbial growth from occurring.

Additionally, when the stabilizer burns in the combustion chamber, it reduces the carbon deposits on valves, injectors, and pistons, leaving you with a cleaner engine that produces fewer emissions.

Other benefits include increased lubrication, improved fuel consumption, increased power output, and cleaner fuel injectors.

This fuel stabilizer looks a little expensive when you compare it to others on our list, but for its quality and effectiveness, it is still fairly priced.


  • Eliminates water in fuel
  • Increases lubrication
  • Boosts power
  • Increases mileage
  • Cleans fuel injectors


  • Relatively more expensive

How to Buy the Best Fuel Stabilizer

How To Buy The Best Fuel Stabilizers
How To Buy The Best Fuel Stabilizers

There are a number of fuel stabilizers available in the market today and choosing the best product requires you to consider the following things.

1. Compatibility

The compatibility of a fuel stabilizer is very important because it determines the type of fuel that you can use the product on.

A product such as Royal Purple 11722is the best fuel stabilizer for cars because, you might have different vehicles with different engines, and this one works well with all kinds of engines.

However, the ones that are designed to work with specific fuels, such as ethanol blends, feature the best preservation enzymes and ingredients for that particular type of fuel.

The choice between these two though is down to personal preference, but ensure whichever stabilizer you pick, it is compatible with your engine and fuel type.

2. Ease of Use

The fuel stabilizer must be easy to use. That said, it should be mixed properly in the fuel before you start the engine.

The mixing must be smooth and quick so that the stabilization can begin as soon as possible. And the bottle should also make pouring easy.

If the stabilizer is not easy to mix, then its full benefits might not be experienced, and the engine will under-perform.

3. Stabilization Time

The stabilization time also matters a lot when it comes to choosing a fuel stabilizer as it will determine how long you can leave fuel in your car without worries.

Most of these fuel stabilizers will give you a stabilization time of anywhere from one month to over 2 years. Hence, how long you intend to store the car should help you determine the ideal product for you.

Because sometimes you can end up having to store the vehicle for longer than expected, you will always be better off with a product that provides 2-year fuel stabilization like Star Brite 093132.

4. Brand

Does the brand name matter? Yes, it does. The brand name holds a lot of significance and trust to the buyers and thus, you can make your list of the best products according to the brand's popularity, then pick the best from that list.

Most of the famous brands are quite old and have proved their mettle for quite some time now.

Some brands you can trust to have superior quality fuel stabilizer for your engines are Star Brite, Sta-Bil, Royal Purple and Yamaha.

Frequently asked questions

Should I Use Fuel Stabilizer?

A: Yes, if you intend to store your vehicles for extended periods, you need to use it. Without it, the fuel can go stale after sometimes, leading to damages to the engine and other vehicle components.

How Does Fuel Stabilizer Work?

A: They have a special formulation with different compounds that when mixed with the fuel help to prevent the oxidation and breakdown of fuel. Also, they work as antioxidants and absorb water before the fuel absorbs it.

Can I Use too much Fuel Stabilizer?

A: This can react badly with the fuel and cause problems fro your engine. These products will come with specific mixing ratios, and so if you put more than the recommended volume you will be using too much of it.

When Should I Add Fuel Stabilizer?

A: You should use fuel stabilizer as you plan to store your vehicle for winter or when you are planning to leave it without running the engine for several months.

How Long Will Fuel Stabilizer Keep Gas Fresh?

A: It depends on the specific type and model that you are using. However, most good ones from leading brands will stabilize the fuel for anywhere between 12 and 24 months.



Now that you have read this detailed review of the best fuel stabilizer, it is easier for you to choose the most suitable product. Simply consider your requirements like durability, fuel type, and quantity, then pick your preferred product from the list above.

From our list, the Star Brite Concentrated 093016SS takes our top overall spot because, besides working with all engine and fuel types, it also stabilizes fuel for up to 2 years and has a more concentrated formula.

For those that uses ethanol-based fuels, the Sta-Bil 22275 will be our recommendation, while the Sta-Bil 22214 is perfect for those shopping on a small budget.

About Joshua Thomas

Joshua Thomas just simply loves cars and willing to work on them whenever there's chance... sometimes for free.

He started CarCareTotal back in 2017 from the advices of total strangers who witnessed his amazing skills in car repairs here and there.

His goal with this creation is to help car owners better learn how to maintain and repair their cars; as such, the site would cover alot of areas: troubleshooting, product recommendations, tips & tricks.

Joshua received Bachelor of Science in Mechanical Engineering at San Diego State University.

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