I have used MMO as a fuel additive for my small engines and outboards for years and have always gotten long, long life out of them. I also mix it 50:50 with Kroil and use it as an all-purpose cleaner/lube for firearms. For the auto rifles, pistols and shotguns that like to run wet I keep them lubed up with that mix. It seems to lube without gumming up with combustion residue. When my FIL was in the marina business, he used to use MMO to fog engines when winterizing them, as did his father. One tool and die shop I worked in kept MMO around as the penetrating oil of choice, but I never thought it was worth a schitt for that....not even on the same planet as Kroil.
