Quote:
Originally Posted by ctrlz
That's my personal working theory. heavier weight oil leads to slower drainback causing pump cavitation and destruction. That pump stator always fractures at the weakest point, which is where it is cut out for a pivot. I have posted more on this in other threads. This pump was originally designed for the Chevy cruze, and made it over to many other models as a fuel economy enhancer. needless to say, the cruze wasn't intended for 40 weight oils.
To those who might say, "Well, chevy now recommends 40 weight oils for these cars," my response would be, "This is the same company that keeps using this pump that fails."
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When the oil pumps started failing, were for the year models that GM recommended 5w30, not 0w40. 0w40 came out as the official oil for street and track use (for non 1LE ZL1's) in late 2018 for the 2019 year model.
I didn't know the oil pump was from a Cruze. Is this true for the LT4 in the CTS-V and Z06? If it is, then why are did the ZL1 oil pumps fail but not the CTS-V or Z06 oil pumps when they use the same oil?