2024 Gmc Duramax Oil Capacity. Changed the oil filter at 2k and 5k topping off with fresh then changed the oil when the truck said to which was 7700 if i recall. Heavy towing or driving in extreme conditions requires more frequent maintenance.

Factory fill is delvac 15w40. 6.6l duramax oil change guide, including motor oil requirements (viscosity charts and api categories), engine oil recommendations, oil change procedures, service intervals, and a list of relevant replacement parts.