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  1. Question: LB7 FUEL IN OIL

    Duramax First Generation: 2001-2004 (LB7)
    I am having the same problem. its an 03, I rebuilt the engine a couple months ago. Truck runs great besides 4.5 gallons of oil. I sent the injectors out for flow testing and to make sure they were not cracked. New feed lines, new return lines, new banjo bolts and washers for return lines...