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    Penzoil 5w30 twice the noack volatility of 10w30

    Well here goes my first post, hoping someone may be able to enlighten me a bit Getting ready to do an oil change for my 02 Camaro z28. Used to use the 0w30 GC, but I don't have any more left. I was considering putting in either 5w30 or 10w30 Penzoil Platinum or Ultra Platinum, and was...
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