Quote:
Originally Posted by x808drifter
I was trying to point out that while you are correct that oils thin as they go up in temp. Saying you need to run so and so weight is 100% BS without actual proof backing that up. Which is why I asked where that graph came from.
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100% BS? "Actual proof"?
FTR I don't think I've said "you NEED to run XwXX!". I've said that if you operate for extended periods at 270F+ as I do, it's probably good idea to run something thicker than 20-weight. I don't think this is a radical idea...
The viscosity of a 20-weight oil at 270F is going to be a LOT less than it is at normal operating temps of 190-220F. Running 30- or 40-weight at 270F is going to get you closer to what the viscosity of the factory-fill 0w20 is at normal street oil temps. Personally, I've been running 5w30 during track season, may go to 0w40 or 5w40 this year.
Feel free to run 0w20 at 270F while waiting for "actual proof" though!