ValvolineTM Premium BlueTM Heavy Duty Full Synthetic Engine Oil delivers extreme protection for diesel and gas engines. The formula is specially designed for hardworking trucks and equipment in both on road and off highway applications. The engine oil is the "The Only One"TM endorsed and recommended by Cummins and features exceptional oxidation resistance, outstanding wear protection and superior deposit performance compared to industry requirements. ValvolineTM Premium BlueTM Heavy Duty Full Synthetic Engine Oil, How the Tough Get Going.TM