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I just talked to Mobil 1 rep. He said they are now recommending Mobil 1 ESP 0W40 to Chevrolet for all their LT1 and LT4's for the Corvette. He said it was so you could go back and forth between the street and track without continually changing oil from 5w30 to 15w50 and back again. However, for my car, an '18 ZL1 1LE that you deviate from the manual at your own risk if a problem should develop. Of course. What would you expect.
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