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Thanks for all the feedback! How can I post PDF a summary of my UOA from Blackstone as an attachment? I'm new to this forum and cannot find a way to attached a file. The 1997-04 Corvettes had Mobil One as their specified oil, which is why I have always used it. I am not expert, but from the UOA...

I have a 1999 Chevrolet Corvette (LS1 engine) with 91k miles on it. I drive my car pretty hard with a lot of high RPM use once the oil is over 160F. I live near Detroit, Michigan. The owners’ manual call out 5W30 oil to meet the GM Specification 4718M. My car has used 5W30 Mobil One oil since...