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    Oil recommendations for GM Vortec 8100

    I aquired a 2001 GMC Sierra 3500 dually about one year ago with only 57K miles. This truck is used in the non-winter months hauling a 3 horse gooseneck horse trailer around or our old Avion travel trailer - but really nothing more than 7-8K lbs. As soon as I got it I changed the oil, oil...