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When I say worst of times I mean an overheat, marginal fuel pump or other lean condition one might not notice until too late. Motors with the piston thrust on the exhaust side of the jug are more prone to scoring on a lean condition.
I agree with this logic and do the same thing myself. I am coming up on being a professional boat tech for nearly 50 years. Back when I was doing a lot of two stroke work, rings would get stuck and the pistons would melt down, a lot. OMC, Merc, Force, Yamaha, (yes YAMAHA, too!)….same thing. After the bad compression check, we would always paw around the boat and there it would be: Conventional Penzoil, West Marine, or some other crap oil. Quicksilver Premium Plus seemed to be the best.
I tell the story every time this subject comes up; but when I was a kid, a supposed good marine mechanic told me 50:1 was okay for my 1956 7.5 Evinrude with plain bearings. It went about 1000 feet and threw a rod. For the little time we actually put on our engines, why in the world would you want to take a chance? We are the guys that are supposed to SAVE these things, not blow them up!
Long live American manufacturing!