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    GC 0w30 or M1 0w40 in an LS2?

    I just purchased a used 2005 GTO about a month ago. Car currently has 6,3xx miles on the odo. The prior owner used to use M1 0w40. The GTO isn't a daily driver... I might drive it once or twice a week, maybe 1-2k miles a year if that. At any rate, my oil changing schedule would call for...
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