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back several years ago before my dad retired from GM where he was a senior engineering Exec. they had the same question . So they took all major brands of motor oil ( over the counter stuff and no synthetic ) from cheapest to the most expensive and ran bearing tests with the different types of oil . they used main bearings for the test.
and the winner was .....
Castrol GTX , it was one of the cheapest oils used in the test and it way out performed all the others.
It is all I use in my vehicles and have never had a oil based failure.
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