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Nothing called "sea foam" is ever getting anywhere near my engine. Sea salt water is bad news for metal. I prefer Marvel Mystery Oil if I'm adding anything to the gas. Why? I don't know. I guess that's the mystery.
Over 90K on my engine, and no sludge build up inside that I can see ( I had the gearcase open this year).
I used the Marvels as well, along with STP from time to time.
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