Quote:
Originally Posted by Schurkey
GM went on a big crusade decades ago to get people away from 10W-40. This was beaten into our heads at the GM Dealership back in '84, and it wasn't "new" then, although I think it was new-ish.
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Back in those days and even into the 90's, the viscosity index improvers in 10-40 sheared and caused sludge issues. That's not the case today with better oil technology.