Quote:
Originally Posted by Bonburner
it's useful for calculating viscosity curves ~
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I guess? But just from "0W20" or "5w30" you already know viscosity at 0C and at 100C. I wouldn't use the 40C number to extrapolate beyond that range.
On the hot side, you usually have an HTHS at 150C number to go by.
And on the cold side, if you live where it gets *very* cold, you have CCS and pour point temp.