
Sea Foam is a fuel and oil additive used to clean and lubricate fuel systems. It is safe to use in gasoline or diesel engines and can be added to the fuel tank, crankcase, or diesel fuel filter. Sea Foam helps to remove harmful residues, control moisture, and stabilize fuel. It can also be used to clean fuel injectors and carburetors, improving engine performance and longevity. For regular maintenance, it is recommended to add 1 ounce of Sea Foam per gallon of fuel. However, for cleaning, a higher concentration of Sea Foam can be added, with a ratio of up to 2:1 of gas to Sea Foam.
| Characteristics | Values |
|---|---|
| How to use | Pour Sea Foam into the fuel tank |
| How much to use | For regular maintenance, add 1 ounce per gallon. For cleaning, add 2 or more ounces per gallon. For maximum cleaning, add a full 16 oz can of Sea Foam to a low tank (2-3 gallons). |
| Frequency of use | For cars and trucks driven regularly, add to fuel every 3,000 miles. For small engines, add whenever you refuel. For engine equipment used regularly, add Sea Foam to a fresh tank fill every 3 months or sooner. For all other engines and fuel tanks (not used regularly), add Sea Foam to every tank of fuel. |
| Other uses | Sea Foam can also be used in the crankcase and the diesel fuel filter. It can be used to clean the top end of the engine with Sea Foam Spray. |
| Benefits | Cleans and lubricates the fuel system, including fuel injectors and carburetors. Absorbs water inside the fuel tank. Helps engines start easier and last longer. |
| Notes | Sea Foam is safe to use in gasoline or diesel fuel systems. It is made with safe ingredients that will not harm your engine or equipment. |
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What You'll Learn

Sea Foam cleans and lubricates fuel systems
Sea Foam is a fuel and oil additive that can be used to clean and lubricate fuel systems. It is safe to use in gasoline or diesel engines and can help to improve engine performance and longevity.
To use Sea Foam to clean and lubricate your fuel system, pour it directly into your fuel tank. The amount of Sea Foam you use will depend on your specific needs. For regular fuel system maintenance, it is recommended to add 1 ounce of Sea Foam per gallon of fuel. If you are looking to clean your fuel system, you can add 2 or more ounces of Sea Foam per gallon of fuel. The more Sea Foam you add, the better it will clean your fuel system.
In addition to pouring it into your fuel tank, Sea Foam can also be used in other ways to clean and lubricate your fuel system. For injector cleaning machines, a 50/50 mix of Sea Foam and gas is recommended. For diesel injector cleaning machines or when priming diesel fuel filters, you can use 100% Sea Foam. Sea Foam can also be added to the crankcase and the diesel fuel filter.
Sea Foam works to clean your fuel system by removing harmful residues, such as varnish and tar, that can build up on the surfaces of pistons, rings, and lifters. It also helps to control moisture and stabilize fuel. By removing these residues and build-up, Sea Foam improves the engine's ability to cool and lubricate itself, leading to improved efficiency, performance, and longevity.
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It can be used in gasoline or diesel engines
Sea Foam is a fuel and oil additive that can be used in gasoline or diesel engines. It is a premium-grade penetrating oil that works to clean and lubricate your fuel system, helping your engine run better and last longer. It can be used to clean tough road bugs, grime, and other organic residues, as well as harmful fluid residues that cause erratic shifting or rough operation.
When using Sea Foam in a gasoline or diesel engine, it is safe to add more Sea Foam to the fuel as needed. The more Sea Foam you add, the better it cleans. For regular fuel system maintenance, it is recommended to add 1 ounce per gallon of fuel. For cleaning, add 2 or more ounces per gallon to a low tank. For injector cleaning machines, use a 50/50 mix of Sea Foam and gas.
Sea Foam can also be used in diesel injector cleaning machines or when priming diesel fuel filters. In diesel engines, it will de-ice and has anti-gel properties. To use, start by removing the old diesel fuel filter. If you have a drop-in filter, use a siphon to remove any diesel fuel before pouring in the Sea Foam. If you have a spin-in filter, simply fill the filter with Sea Foam and install it.
For gasoline or diesel engines that are not used regularly, it is recommended to add Sea Foam to every tank of fuel. This will help to keep your engine running strong and prevent common engine problems.
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It's safe to add more Sea Foam for better cleaning
Sea Foam is a safe and effective cleaner for gasoline or diesel fuel systems. It is made from petroleum ingredients and does not contain harsh detergent or abrasive chemicals that can harm your engine or fuel system components.
For regular fuel system maintenance, it is recommended to add 1 ounce of Sea Foam per gallon of fuel. However, for better cleaning, you can add more Sea Foam to your fuel tank. The general rule is that the more Sea Foam you add, the better it cleans. Specifically, for cleaning, it is recommended to add 2 or more ounces of Sea Foam per gallon of fuel. If you want to achieve maximum cleaning, you can add a full 16-ounce can of Sea Foam to a low tank (2-3 gallons) and then drive until almost empty before refueling.
Sea Foam helps to lubricate the moving parts of your engine, especially in the fuel system. It also absorbs water inside the fuel tank, allowing it to be burned in the combustion chamber without any issues. By removing harmful residues, varnish, and carbon deposits, Sea Foam helps to restore your engine to top working order, improving its performance and longevity.
It is important to note that Sea Foam should not be applied directly into the intake tract for cleaning the top end. Instead, it is recommended to use Sea Foam Spray as directed, as it is a better method for distributing Sea Foam where it needs to go.
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Sea Foam can be added to the crankcase
Sea Foam can also be added to the crankcase to stabilize stored fuel for up to 2 years. Adding Sea Foam to stored tanks helps fuel resist evaporation, preserves ignition vapors, adds protective lubricity, and prevents the formation of gum and varnish in fuel systems. Gum and varnish residues are the most common cause of poor engine function.
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It helps to stabilise stored fuel
Sea Foam is a fuel and oil additive that can be used to stabilise stored fuel. It is a premium-grade penetrating oil that works hard and lasts long. It is safe to add Sea Foam to gasoline or diesel fuel systems, and it can be used in hybrid vehicles as well. The more Sea Foam you add to the fuel, the better it cleans.
To stabilise stored fuel, add at least 10ml of Sea Foam for each litre of tank fuel. Run the engine long enough for the treatment to work through the entire fuel system. Adding more Sea Foam when the tank is low will increase the cleaning and lubricating ratio when working the treatment into the engine. You can fill the tank with fuel after preparing the upper engine areas for storage. Sea Foam Motor Treatment works to stabilise stored fuel for up to 2 years.
Sea Foam helps to stabilise stored fuel by absorbing water inside the fuel tank, allowing it to be burned up in the combustion chamber without issue. It also helps to control moisture and stabilise the fuel. In diesel engines, Sea Foam has de-icing and anti-gel properties.
Sea Foam also helps to prevent the formation of gum and varnish in fuel systems. Gum and varnish residues are the most common cause of poor engine function. Using Sea Foam in stored fuel will help your engines start easier and last longer. It also helps to preserve ignition vapours and adds protective lubricity.
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Frequently asked questions
For regular fuel system maintenance, add 1 ounce per gallon. For cleaning, add 2 or more ounces per gallon to a low tank. The more you add, the better it cleans.
For cars and trucks driven regularly, add Sea Foam to the fuel every 3,000 miles. If you plan on using the entire tank of fuel in 30-45 days, Sea Foam can be added at a regular maintenance interval of 3,000-5,000 miles. If it will not be used in 30-45 days, use Sea Foam in every tank of fresh fuel.
Pour Sea Foam into your fuel tank to clean and lubricate your entire fuel system. Run the engine long enough for the treatment to work through the entire fuel system.











































