Quote:
Originally Posted by ZDan
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!
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That wasn't meant at you directly. More for those in here that
have said you need to run a certain weight. (although it does look that way)
And again nobody is arguing that oil gets thin at hot temps.
I just asked for proof for some of your comments like
Quote:
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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.
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Where did you get this info from?
That is all I am asking. My Google-Fu is failing me when it comes to finding actual tests for this stuff. (Being at work isn't helping)
Or are you just regurgitating stuff you heard over the years?
Just like the ol' 10PSI of oil pressure per 1k RPM.
That was a rule of thumb for small block Chevy's and nothing else. Yet people still spread that one around like it applies to all motors.