I have a cousin who works offshore as a mechanic. Every year he rebuilds giant 2 stroke diesels. He says that they purchase MMO by the barrel to have shipped out there. I decided to try some for carburated lawnmower that "hunts" (rpm up and down). My engineer father in law just said some small engines do that. Well, mmo cured it. I have purchased more and am putting it only in my fuel.
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