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As ChrisLS3 says we don't know for sure that the oil pump failed but it is a likely culprit knowing the history of oil pump failures. I find it strange the dealer began the tear down without authorization to proceed from GM unless I missed something in all of the posts?
I would still be hammering on the dealer for running an oil starved car to diagnose it thats just brain dead! It should have not been run further until a root cause was determined. If we have to let the car run until it goes boom to determine lack of oil pressure then we may as well start buying lottery tickets next....
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