Should we be using lighter weight oil?

George Harris harchris at
Mon Dec 30 19:43:30 EST 2002

> That says it all for me.  I like numbers as much as the next engineer, but
> a 5w rating doesn't mean much to me if my engine can't pump it in the morning.

Aren't you comparing Apples (regular oil) and Oranges (synthetic)? Now
try comparing the flow of 0W40 and 15W50 at the same temperature. In my
experience any oil, including the 10W50 synthetic that I use, is pretty
thin at operating temperatures. I think you want that flowability when
you first start the car at 5 deg F.


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