General motors has been putting it in at the factory for years in corvettes &
gmc syclones. I doubt they would spend a extra nickel on a car if they did
not think it was worth it. M 1 is available in 0w30 5w30 & 15w50 & maybe
more. The synthetic oil has a better film strengh which means it clings to
engine parts better which is vital at cold start up, which is were most wear
is just my opinion .Bye the way im not using it yet in my b's gotta fix them
oil leaks first ya know
Ray Huff
741/2 bgt 76 roadster
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