Quote:
Originally Posted by b.e
Well, I don't know if this is true. The point of multi-grade oil is to make this not true. The cold viscosity ("0W" is lower than the hot viscosity ("-20") meaning the oil flows better when cold and thickens at it heats up. Whatever chemical properties cause this to happen (I'm a chemist and I don't know how they do this) might extend above the 100 centigrade test temperature. If they do, then what you say is false. If the inverted viscosity behavior fails at some point above 100 c and the oil starts acting like most other fluids, then what you say is be true.
Wish I could find out which it is.
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For anyone reading this thread please take note that the quoted text above
is not true.
Sorry b.e., not trying to rain on your parade but what you state is a common misconception about oil rating. Thanks for your understanding.