Norm Peterson
corner barstool sitter
True.My limited understanding:
https://en.m.wikipedia.org/wiki/Viscosity
Viscosity is resistance to flow.
Viscosity changes with temperature!
The problem seems to be that viscosity (as a measured quantity) gets confused with viscosity index and oil "weight".
I suspect that oil temperatures commonly exceed 240°F in summer street/highway driving, almost certainly so if the coolant is running over 200°F. Not an environment I'd ever use 5W20 in (it certainly won't be running as a "20-weight" oil at that temperature, maybe not even as a 15 either).
Norm
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