How to use Sea Foam in oil

Yes, you can leave Trans Tune in the transmission for the life of the transmission fluid (until your next regularly scheduled transmission fluid change…)

Great question, William.

The #1 cause of a rough-running marine engine is heavier suspended fuel gum and petroleum varnish that restricts fuel passageways. The most important thing Marine PRO does is liquefy and clear away sticky gum and varnish restrictions so the engine can go back to starting fast and running strong.

I’d recommend using Sea Foam Marine PRO (though the classic Sea Foam Motor Treatment will work too). If the rough performance is caused by gum and varnish, Marine PRO will clear up the problem. It’s made with 100% safe petroleum cleaning and lubricating ingredients, so it’s okay to use in your boat.

Here’s what I’d do:

Wait until you have a low tank of fuel (1-3 gallons). 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. Then, refill your fuel tank as normal.

For upper engine cleaning (fuel injectors/carburetor circuits & chamber deposits that can affect running performance), it works much better to add the full can to a low amount of fuel for two reasons, 1) the cleaning concentration is considerably greater and, 2) the cleaning effect will start much faster with greater effectiveness. If you were to add Marine PRO to a high volume of tank fuel, it might take several hours of engine running for a lower concentration of the treatment to work its way through the fuel lines and through the engine. Understanding the concentration approach will go a long way in terms of understanding how Sea Foam’s engine products work for overcoming fuel residue restrictions or a rough-running engine. Pay attention to starting, smooth idle, throttle response, hole shot, acceleration, and top speed. If the problem is caused by fuel residues, Marine PRO will help overcome it. Either way, it will do a good job cleaning up your engine.

Yes, lots of people use it for that. Sea Foam Motor Treatment will stabilize stored fuel up to two years. Add 1 ounce per gallon of gas in the jerry can.

Yes, you can use Deep Creep on a stuck needle valve. Sea Foam Spray would work too!

Thanks for the question, Marc. Yes, you can use Sea Foam Motor Treatment with Stabil 360. It’s safe to mix with other additives like Stabil.

Side note: we get a lot of questions about ethanol and there are a lot of ideas floating around about what it does in fuel. Be aware that adding a fuel treatment isn’t going to change ethanol from what it is (ethyl alcohol). Just know that when combined with water, ethyl alcohol has corrosive potential in a fuel system.

That said, stabilizing your fuel and adding something like Sea Foam Motor Treatment (which is made with petroleum ingredients that will add protective lubricity to fuel system parts) like you are doing will go a long ways toward keeping your small engines running well.

Hope that helps and thanks again for the question!