While I will agree that there will never be "the one" as far as oils go, I switched to the M1 0w-40 over the last two years in my modded 07 Z06, and according to my Blackstone reports (which I see little reference to in this thread), it held up well, and the wear indicators in my motor were all well within parameters. The 0W-40 fill is the European factory fill for Z06's sold over there. There was a lot of speculation on the Corette forums as to why that was, but all I can attest to is the oil worked very well in my Z06, which was much tougher on oil than my Nismo is....again, my .02's.
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