2025 Duramax Oil Capacity V6. 2 of mine run delo 5w40 year round and the newest one i'm trying the ultra low ash delo 600 adf 15w40. I've had my 2025 sierra 2500hd for a fairly short time and only have 470 miles on it, yet the oil life indicator already reads at 77%.
It’ll give you details about how much of. 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.