Quote:
Originally Posted by serialk11r
EDIT: Okay nevermind couldn't find it, but I'm not sure how much higher temperature say 40 or 50 weight oil can take and still maintain 20 weight oil (at more reasonable temperatures) viscosity, I have a feeling it's not that much.
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You'd run thicker oil at the track not to preserve its viscosity after it cools back down from elevated temps, but to have the appropriate viscosity at elevated temperatures. I.e., if your oil runs up to, say, 275F at the track, a 30, 40 or 50 weight oil is going to be a lot closer to the right viscosity than a 0W20, which might be dangerously thin at that temperature.
(Obviously you'll want synthetic if you are running elevated oil temperatures, whatever weight you run.)