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I have been running 10w-30 synth(no particular brand) in my 99 Z since I bought it used back in 2000 with 22k on it. I now have 85k on it and it is still running strong with no leaks(knock on wood). I live in the Tampa Fl. area so my engine knows heat and I don't really have any knock at startup, though I will get some pinging etc. if I stomp on it either from a stand still or while driving down the road.
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