How much Marine PRO for outboard maintenance [SOLVED]

How much Sea Foam Marine PRO should I use for 10 gallons of gasoline on a regular fill-up basis with a four-stroke 90HP outboard motor?

Notify of

1 Comment
Newest Most Voted
Inline Feedbacks
View all comments
Jim D.
Jim D.
1 year ago

Thanks for the question, Larry. I’d simply add a full can (20 oz) to every tank. That amount will work very well to keep your outboard running clean and your fuel stabilized. At a minimum, use 1 oz of Marine PRO for every 1.5 gallons of fuel.

If you want to run a cleaning dosage every once in a while, add a full can to a low tank (about 1-2 gallons) and run it until almost empty before refueling.