10 Best Boat Fuel Stabilizers In 2023

This is a stabilizer which aims for better performance. It has slightly different ingredients compared to other STABIL products we talked about. By using this product you will improve the work of your motor. It cleans the system, leading to better fuel economy because burning is more efficient. You will get more miles per gallon and you will also increase the durability of your motor.

For best results, it’s recommended to use every time you fill up the tank. The dosage is 1oz per 5 gallons, and you don’t need to overstep it because it’s very efficient. In addition to all things mentioned, it’s an excellent stabilizer for storing purposes too, so you’ll be getting a very versatile product. Finally, like other STABIL products, it’s made in the USA.

Here we have one more product from Star Brite, this time in a smaller package. This 32oz bottle will be enough to treat up to 512 gallons of your fuel. It’s a medium concentration product, which they label as 930XX. Two more concentrations are also available – 143XX small engine formula with 1oz per 6 gallons and the super concentrated 12501 formula which treats 25 gallons with just 1 ounce of the product.

This marine fuel stabilizer helps prevent phase separation, and stabilizes fuel for up to two years. While it’s recommended to add it to fresh fuel, it can even rejuvenate old fuel and slow down the degradation process. Special enzyme technology takes care of both the fuel and the entire engine system, so you can have peace of mind when you put this in your boat.

This is great product which comes in a 32oz bottle. It’s highly concentrated, so a small amount can be effective on a lot of fuel. This is recommended to be used for 512 gallons of fuel (or 1oz per 16 gallons). Because gasoline is degrading very quickly, you need a stabilizer right away.

If you pour this in fresh fuel, it can keep it stable and usable for up to 3 years, which is excellent. In addition, many users claim that it has preserved their fuel for even longer. Like all other quality gasoline stabilizers it can clean the system and remove gum and varnish which will increase motor performance, when you decide to run it again.

Here we have the most affordable product in our boat fuel stabilizer reviews – but this doesn’t mean it’s not efficient. It comes in a 16oz bottle which is enough to treat 80 gallons of fuel. It works well with both 2 and 4 stroke engines. The concentrated formula will save your fuel for up to 3 years.

It’s truly a full spectrum additive, which will also prevent corrosion, guard your metal components and refresh the whole system. This is a genuine Briggs & Stratton part 100119 which can replace many other previous products if you are used to buying from this manufacturer. As with others, the best results are achieved when added to fresh fuel.

One more great product from Star Brite – this one is specially designed for diesel engines because diesel fuel needs to be treated too. It comes in an 8oz bottle which can treat up to 256 gallons of diesel, meaning this product is highly concentrated – you need only 1oz per every 32 gallons.

Using unique enzyme technology, it helps disperse the water, and breaks down sludge into small pieces, allowing the engine to burn everything and remain clean. This leads to lower system maintenance, and also lower harmful emissions. It will save your fuel for up to 2 years, and also ensure there is no corrosion in your tank.

Mercury is a renowned manufacturer of outboard motors, and this is a fuel stabilizer they recommend for their motors. It comes in a 12oz bottle, and 1oz is used to treat 5 gallons of fuel. It’s recommended to use it throughout the whole season, so you can be sure the motor is going to be reliable at all times.

It’s a good idea to add this octane stabilizer to the tank even if you don’t use ethanol fuel, because it will keep everything clean. After the winter break you’ll have absolutely no problems starting the motor, so you can relax and enjoy.

This is the final product from STABIL, and it comes in a truly economic package. It’s essentially very similar to the 360° Marine we talked about earlier, but this one is certainly a better choice if you have several fuel tanks and engines that require treatment. For a great price, you get a 1 gallon package, which can treat a really large amount of gas. You should add 1oz per 5 gallons for storing, or 1oz per 10 gallons for daily use.

Manufacturer guarantees up to 12 months of fresh fuel with this additive. It does all the positive things it should – prevents ethanol problems, corrosion and cleans the fuel system and motor. Finally, it has the mentioned Vapor technology which works as an anti-oxidant for great fuel stabilization.