HOW TO USE SEA FOAM SPRAY
BENEFITS
TREATMENT RECOMMENDATIONS
FOR GAS FUEL INJECTION – DIRECTIONS
FOR CARBURETOr INTAKES – DIRECTIONS
FOR ENGINE FOGGING – DIRECTIONS
SUMMARY
Sea Foam Spray is a blend of cleaning and lubricating petroleum ingredients that can be used SAFELY in all types of 2 and 4 stroke gasoline engines. Especially important for modern GDI engines, it cleans critical upper engine areas where fuel cleaners can’t reach.
Apply Sea Foam Spray through fuel injection throttle bodies to clean harmful engine deposits from intake valves and combustion chamber areas. Use Sea Foam Spray to fog engines and coat spark plug cavities to protect your engine during storage.
Sea Foam Spray does NOT contain harsh detergent or abrasive chemicals that can harm your engine or fuel system components. Help your engine run cleaner and last longer!

HOW TO USE SEA FOAM
spray
RELATED QUESTIONS
I want to use the spray in my Mercury outboard motor to winterize the motor. I’m supposed to remove the two spark plugs and spray one ounce of the Sea Foam into each spark plug hole. How long do I spray to give one ounce?
Thanks for the question, Bill. I’d use about a 2-3 second burst. Then, with the ignition off or the battery disconnected, turn the engine over by hand 2 full rotations (do not use a starter). If the engine has a pull start, with the ignition off or the battery disconnected pull the rope slowly twice.
Here’s an overview article with a few other thoughts on boat storage:
https://seafoamworks.com/how-to-store-a-boat/
And here’s a PDF dedicated to marine engine storage.
https://seafoamworks.com/wp-content/uploads/2024/04/HOW2_Marine-Engine-Storage.pdf
Can I use Sea Foam Spray to clean the O2 sensor that got covered with undercoating oil?
Which exact Sea Foam product do I need to spray through the spark plug holes?
Does Sea Foam harm oxygen sensors or any others sensors?
Thanks for the question, Chris. No, when used as directed, Sea Foam products do not harm oxygen sensors or any other sensors. When applying Sea Foam Spray, just make sure you apply it downstream of the Mass Air Flow sensor (MAF sensor). Most MAF sensors are a safe distance upstream of the throttle plate anyway. Hope that helps and let me know if you have any other questions!
Hello. For a 1998 Suzuki Sidekick 1.6L 16v piston carbon clean, I’ve been advised to spray an entire can of SF into the disconnected brake booster hose with engine running. When can is empty, turn engine off. After one hour, start engine and exhaust will belch black or white smoke, expelling the detritus of the cleaning. Could this be done but let the SF soak overnight, then start engine? And to be thorough, could this clean be done say three times in succession? Thank you.
Thanks for the question, Eric!
We do not recommend applying Sea Foam through the brake booster hose. Do not apply it through the brake booster line.
Instead, use Sea Foam Spray as directed on the can through the intake. Sea Foam Spray will do a better job cleaning, feed all cylinders evenly, and safely remove carbon deposits without the risk of hydrolocking and harming your engine. That will work much better and safer for your engine.
You can do two applications in a row for a thorough cleaning.

Jim D.TECH
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