Not trying to sound antagonistic. 6500 miles is on the high side for any oil. As you probably know. You want the oil to stay in the motor not drain away into the pan. Of course sludge is another matter. The thing about RP is that it looks used right out of the bottle. Amsoil and Redline are very good. I know a few racers that swear by it. RP is a very small company, as far as the petro business goes. Chevy swears by Mobil but Chevy as a company has been "crap" since the early 70's. They never really recovered fromt the great oil embargo. Even Vette race teams have told me to avoid Chevy replacement parts whenever possible. A friend of mine just blew up a 2010 Z06 goin 175. The Chevy mechanics said the bearings gave out probably from oil starvation. A 200+mph car blows at 175...either bad parts or inadequate oiling. Makes me wonder about Mobil & Chevy.
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