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Best Fuel Stabilizer

Best Fuel Stabilizers 2021: Reviews + Buying Guide


Whether you’re putting your car away for a winter nap, or you’re moving it into long term storage adding fuel stabilizer is a good idea. With that being said you’re probably going to want to know what the best fuel stabilizers are for your car.

There are literally dozens of brands all with various claims that they are the greatest fuel stabilizer out there. It can be quite the headache to sift through the market to find which one will be right for your car and your unique long term storage situation.

To make a long story short when it comes to which is the best, STA-BIL 22214 Fuel Stabilizer ranks number one in our opinion. Let’s now take a closer look at it and a few other top ranking fuel stabilizers for your car:

A Spotlight On Some of The Best Fuel Stabilizers 2021 :

STA-BIL (22214) Fuel Stabilizer- 32 fl. oz


PRI-G CP123 Gasoline Treatment


Royal Purple’s Max-Clean Fuel Stabilizer


Star Brite Star Tron Enzyme Fuel Treatment


Yamaha “Yamalube” ACC-FSTAB-PL-32


STA-BIL 22214 Fuel Stabilizer

The company responsible for the STA-BIL brand was started in 1932 out of a small storefront in Chicago. These humble beginnings have seen this brand grow and quickly become the number one fuel stabilizer in the world. There’s a reason for this growth and market dominance. The product works and and it works very well!

STA-BIL is considered to be the granddaddy of all the fuel additive brands and you can’t go wrong by trusting your car’s fuel system with their products. The 22214 is one of their most popular blends of fuel stabilizer product. Not surprisingly, it can keep your car engine’s fuel fresh and stable for up to 2 years in proper storage conditions.

One of the best things about STA-BIL is that you do not need to drain your fuel prior to using it. You can just pour it in, run your car for about 5 minutes, and then you’re good to go. It also gets rid of corrosion causing water. It even cleans your fuel injectors or carburetors.

It will also protect your engine in several ways. First it will protect your engine from corrosion, rust, varnish, and gum. This protection has a nice side effect of increasing the life of your engine allowing you to go even more miles in your car.

This is one of the best fuel stabilizers because it works on any sized engine. From small 4 cylinder engines found in economy cars and small SUVs all the way up to large V8s found in luxury SUVs and sports cars. You can use it with all gasoline types, including 87, 89, 91, and 93 octane. It also works with Ethanol blends like E-85. One ounce of STA-BIL will treat 2.5 gallons of gasoline, so keep that in mind when ordering yours.

  • Pros
  • Your car will start easily and quickly after being stored with it
  • Protects your engine from several things prolonging engine life
  • Number one fuel stabilizer brand worldwide
  • Cons
  • May be slightly difficult to pour into new cars gasoline filler neck

PRI-G CP123 Gasoline Treatment

This product comes in second on our list of best fuel stabilizers. It’s a concentrated product which means you’ll need to use less to treat your fuel. You’ll be able to treat much more fuel out of a similar sized bottle to other popular products. PRI-G comes from Power Research, Inc which is a Houston based chemical company founded in 1985.

They’ve been making this stuff for years, and its earned a solid reputation online as well offline. It’s popular in both the emergency preparedness community and the automotive community. This product uses a unique chemical blend that reacts immediately with fuel to stabilize it on a molecular level. You can even add this product to old bad fuel and have it be brought back to refinery freshness.

You can expect increased engine performance from this product as well. Treating your fuel with PRI-G will improve the combustion process, increase power, and increase fuel economy all at the same time. This product even will lower pinging, hesitation, and knocking that is common in older gasoline engines. Emissions are also reduced significantly with regular fuel treatment from this product.

No matter what you’ve been told, gas ages very fast. That’s why this product is such a necessity. You can annually treat your gas for years and have it remain fresh with PRI-G. It’s also highly concentrated which means you only need to use a fraction of it to treat your average sized car or SUV gas tank. This means you get more bang for your buck. It will also work on any sized engine from 4 to 12 cylinders. So no matter if you have a small Honda Civic or a huge Ford F150, this product will treat your gas and keep it fresh.

  • Pros
  • Works with all engines and gasoline types
  • Can bring old fuel back to fresh
  • Super concentrated, use less, get more bang for your buck
  • Shelf stable after opening for 3 years
  • Cons
  • Does not work with Diesel fuel, so if you have a diesel vehicle you will need to use a different stabilizer

Royal Purple’s Max-Clean Fuel Stabilizer

Not only is the third entry on our best fuel stabilizers list a stabilizer but its also a fuel system cleaner. Royal Purple is a Texas based lubricants company founded in 1986 by a former synthetic oil engineer. They’ve been at this for quite a while and one of their best selling products is their Max-Clean Fuel Stabilizer. This product does double duty of cleaning the fuel system and stabilizing the fuel itself.

Because of the state of the art chemical technology used to develop Max-Clean you can expect an increase in engine performance, increased idle smoothness, and reduced hesitation. It also cuts emissions and hydrocarbons by a significant percentage. You’ll also enjoy cleaner spark plugs and get more life out of them. If you’ve got a knocking or pinging engine, you may want to try some of this before committing to an expensive engine tear down and rebuild.

This is truly a MAX cleaner as right after application it will clean your combustion chambers, intake valves, carbs, and/or injectors. Royal Purple has done extensive tests with product across a wide variety of cars, trucks, and SUVs an on average after use you can expect to see a 2.6% increase in power, and a 3.2% increase in fuel economy. That being said you can use this on any sized car engine that runs on gasoline.

We can’t say enough about how great of a cleaner this is, but this is a fuel stabilizer post…

So does this product stack up as a stabilizer? You bet it does. One can will treat up to 20 gallons of fuel and prevent it from varnishing. This will keep the fuel stable for up to an entire year.

  • Pros
  • Increased power and fuel economy
  • Smooths out idle and reduces knocking, pinging, and hesitation
  • Cuts emissions
  • Keeps fuel stable for a year
  • Cons
  • Priced on the higher end of the market

Star Brite Star Tron Enzyme Fuel Treatment

Star Brite was founded in 1973 based on a popular automotive polish product. They soon quickly recognized an opportunity in the marine industry for appearance products and grew to dominate that industry.

Expanding again back into the automotive space they created several cleaners, polishes, and additives. One of them being their Star Tron Enzyme Fuel Treatment. This product has been selling well for them and it has earned them the fourth spot on our best fuel stabilizers list.

This product allows you to stabilize your fuel and keep it ready to use for a year. You can expect to come in and start your car right up after it has been stored. It will even drive like you’ve been using it everyday.

One of the other big benefits of this product is that it counteracts the negative aspects of ethanol treated fuels, which many gas stations have available these days.

The enzyme in this stabilizer will react immediately with your fuel keeping water from forming a harmful layer in your fuel system. It also helps your engine run more smoothly and efficiently. This means a smooth idle and smooth power delivery throughout the entire RPM range.

This product is also a cleaner like the previous product on this list. It will help clean the engine harming carbon deposits and also clean your entire fuel system. You might even notice a slight power gain that comes in addition to a smooth running and easy starting engine.

Star Tron is also a very concentrated product. One small 8 ounce bottle can treat 48 gallons of fuel. This means you get more use out of a smaller package and enjoy a nice bang for your buck.

You can even use it to breathe a new life of freshness to old stale fuel. So if you’ve got some untreated gas that has been sitting in your tank, add some of this product to it before starting it. You’ll be surprised when it cranks right up.

  • Pros
    • Keeps fuel fresh, stable, and ready to use for up to a year or more
    • Cuts emissions
    • Improves power, smoothness, and fuel efficiency
    • Concentrated so it doesn't take that much to treat an entire fuel tank
  • Cons
  • Bottle may be hard to pour, best if you use a funnel

Yamaha “Yamalube” ACC-FSTAB-PL-32

Yamaha was established way back in 1887 as a organ and piano manufacturer. After a while they ventured into all types of industries one being motorcycles in 1955. From there they started the Yamaha Motors Division and soon became a heavyweight in the industry. Now they manufacture all different kinds of automotive products from engines to lubricants and even fuel additives.

Their “Yamalube” Fuel Stabilizer & Conditioner has been a top seller for them and for good reason. It’s so good in fact, that out of dozens of offerings on the market they rank fifth on our best fuel stabilizers list.

This product works with all different types of gasoline, and it will keep your fuel stable for up to a full calendar year. It does this by preventing corrosion and varnish that is caused by old fuel sitting in your tank for an extended period of time.

It also will protect your engine and increase performance and fuel efficiency. It also helps to increase the combustion rate of the fuel as well. All in all it’s a great fuel stabilizer with the bonus of being a great fuel conditioner and great fuel additive wrapped up into one.

Unlike some of the other products on this list, it’s not a concentrated product. One bottle will only treat around 5 gallons of fuel, so you’re probably going to need 2 to 4 bottles to treat an entire tank on your car, truck, or SUV.

  • Pros
  • Excellent way to stabilize fuel for up to a full yeard
  • It's a stabilizer, conditioner, and additive all wrapped up in one package
  • Provides superior engine protection
  • Increases power and fuel economy
  • Cons
  • May need multiple bottles to treat your whole fuel tank

Best Fuel Stabilizers Buying Guide

As you can see this is the upper crust of the fuel stabilizer marketplace. If you'd like to continue to shop around on your own to see what else is available out there we'd recommend you stick to the buyer's guide below.

It will help you make sense of the market by providing you with several factors that you should consider before purchasing fuel stabilizer. So with that being said, let’s get started:

Ease Of Use

The first thing you’d want to consider when looking at a fuel stabilizer is how easy is it to use. Simply put, the longer the stabilizer lasts, and the less you have to treat your fuel the better.

Also consider the bottle design when taking ease of use into account. Since many stabilizers require .5, 1, 2 or even 3 ounces per gallon you’d want to make sure there was an easy surefire way to measure those ounces on the bottle itself.

Using a stabilizer that has a lower stabilization rate may be cheaper. However, in the long run you’re going to have to remember to keep up with your fuel treatments. If you don’t the fuel will go south on you and you’d end up in the very situation you were trying to prevent.

Fuel Compatibility

While the five products listed on our best fuel stabilizers list all work with cars with gasoline engines, not every stabilizer will work with every fuel type. This is something that’s ultra important for you to remain aware of.

Some fuel stabilizers will work with gasoline, ethanol, or diesel. Sometimes all three or sometimes a combination of the three. So please read the product descriptions closely to make sure the product you’re looking at is compatible with your car’s fuel type.

If you fail to do this and put the wrong stabilizer in your tank you can cause some real damage. You may be lucky and only need to have your system cleaned out.

In other cases you might cause serious damage to your fuel system and need multiple parts replaced or repaired. This can all add up to some really expensive mechanic bills. So do yourself a favor and pay attention.


While always buying name brand may not be important with other types of products, staying with a trusted fuel stabilizer brand is very important. The top brands in this industry have been around for decades. They have literally pumped hundreds of thousands of dollars into formulating these products and back them up with extensive testing.

A no-name company might be able to offer you a cheaper price, but you aren’t getting this decades long experience, premium formulations, and testing. Your fuel system is one of the most crucial parts of your car. Do you really want to trust it to a company with little to no track record just to save a few bucks?


One thing you’ll notice about our list of best fuel stabilizers is that the pricing on them is really fair. We’ve done this for a reason because we don’t think you need to break the bank to get a quality product that delivers real results.

However, your budget for this is going to ultimately determine which product you use. If you’re on a super limited budget we’d suggest choose a stabilizer that is concentrated.

Concentrated products treat more gallons per ounce than non concentrated ones. So you’ll be able to get the most bang for your buck with these types of products.

Customer Reviews

One thing the internet age has bought us is the ability to get review information about almost any product that exists. Fuel stabilizers are no different. Whether you’re purchasing them from Amazon or another online retailer, make sure you seek out the customer reviews for the products.

If a large majority of the reviews aren’t positive then its probably a good idea not to purchase that stabilizer. Also look for common trends in the product reviews. Are people mentioning the same issue over and over, like delivery issues, or being sent the wrong product? If so then you may want to seek out a different product with less of these types of reviews.


Hopefully you’ve found our best fuel stabilizers list and buying guide helpful. With this information you’ll be able to easily choose a stabilizer that works for your car and your unique storage situation.

If you don’t choose one of the five we’ve picked out you now have knowledge, thanks to our buying guide, on how to find a good stabilizer for you.

We’d like to thank you for stopping by our site and taking time out of your busy day to read our post. Please leave a comment below and let us know what you think.

Happy stabilizer shopping!

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