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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    My 2008 GMC Sierra 2500HD Duramax LMM with 98k miles is overheating while towing a 7000lb travel trailer. I just purchased it, it’s completely stock except for a 6” rough country lift. Radiator is not leaking, and coolant level is good. Engine oil level is good. However, the oil pressure gauge...
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