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  1. Amsoil dealer

    Weapon X Motorsports
    I'm a big fan of Amsoil and have ran it in my CTS V from the engine oil, to the trans, and diff fluid. I haven't had a chance to check my rear diff on this car yet, but GM is well known for underfilling them by a LOT on other high performance models, so they're worth a check. I'm VERY well...