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  1. J

    Amsoil ASL 5w-30, 8152 miles, 2007 GMC 2500HD 6.0L

    This is my first time posting here. 2007 GMC 2500HD 6.0L Amsoil ASL 5w-30, Ea50 oil filter and Amsoil Eaa123 air filter installed 3/27/09 at 19627 miles 8/09/09 date of sample 27,812 miles on truck at time of sampling, 8,185 miles on sample I drive primarily mostly highway miles during the...
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