Better gas mileage for Hummer - Oil Change - Hummer Best oil recommended for Hummer H1 and H2 for those who use 5W30, 10W30 or 10W40. Best for 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004


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