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How many extra engines do you have?
OK, maybe that's an exageration, but IMO, it just isn't worth saving a few bucks / pounds.
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Ok let me explain my self, when I mentioned thinner oils I was not referring to saving pesos, dolares or dollars I was referring to performance gains for example when I used to compete in solo events at the local racetrack I went from 50 weight to 10w30 synthetic and I noticed a slight difference in time about half a second faster per lap maybe because it was easier for the engine to move that weight of oil I could do this back then because as you all know you can get away with it if you just run 3 or 4 laps full throttle per heat like in solo events but anyway now that I have your input on this matter I go with the 40 or 50w synthetic thanks you guys been a lot of help. :023: