Thanks for the question, Laura. Yes, you can add multiple cans of Sea Foam. I’d wait until you have a low tank (2-4 gallons) and add a can or two of Sea Foam (or Sea Foam High Mileage, which is a great cleaner.) Then, drive it until almost empty before refueling.

Using a high concentration is a great way to clean up fuel injectors. It wouldn’t hurt anything to add three cans, but it’s probably not necessary.

Thanks for the question, Shahid! Here’s the difference:

Sea Foam Motor Treatment:

• How to use it: pour it in your fuel tank or oil crankcase
• What you can use it in: any gas or diesel engine. It’s safe and effective in any kind of gas or diesel fuel, and any kind of motor oil.
• What it does: cleans fuel and oil residues to help your engine run cleaner, run better, and last longer

Sea Foam Spray:

• How to use it: apply it through a gas throttle body or carburetor
• What you can use it in: gas engines only. Particularly useful in gasoline direct injection engines. NOT for use in diesel.
• What it does: Sea Foam Spray is an aerosol version of Sea Foam Motor Treatment. Sea Foam Spray works through a gas engine’s upper air intake to dissolve harmful deposits and residue buildup from intake runners, intake valves, and combustion chamber areas. It’s especially helpful for cleaning intake valves in gasoline direct injection engines (GDI).

In short, both products will clean critical engine areas to help your engine run better and last longer.

Hey Stephen,

Good question! Sea Foam Motor Treatment will keep fuel fresh for up to two years. More specifically, it will preserve ignition vapors and prevent fuel gum and varnish from forming.

Note: Sea Foam won’t “restore” old fuel. Add it to fresh fuel before storage.

Good question, Dan.

It’s safe to add a lot of Marine PRO to your boat’s gas tank. In fact, a high concentration of Marine PRO in fuel does a great job cleaning up fuel residues and deposits that often cause performance problems like rough idle, hard starts, and loss of power.

Here’s what I’d do: Wait until you have a low tank of fuel (1-2 gallons). Then, add a full can of Marine PRO to the fuel. Run your boat at least 20 minutes if you can (just don’t run out of gas!), and don’t be afraid to run it hard. After that, refill your fuel tank as normal and add 1 ounce of Marine PRO per gallon of fuel. That will prevent fuel from degrading and preserve ignition vapors.

In oil, add 1 ounce of Marine PRO per quart of oil.

Good question. Sea Foam Motor Treatment will stabilize stored fuel up to 2 years. Sea Foam will help preserve ignition vapors and prevent fuel from degrading.

Here are a few things to keep in mind:

• It’s best to add Sea Foam to fresh fuel (rather than fuel that’s already been in a gas can for a while).
• Sea Foam can’t “restore” old fuel.
• Add at least 1 oz of Sea Foam per gallon of fuel that you’re storing.

Hope that helps and let me know if you have any other questions!