Shell ROTELLA® T4 Triple Protection builds upon the heritage of Triple Protection technology that customers have come to depend on. Today, it is more advanced than ever before designed to provide harder working protection that adapts to your driving conditions. Features: Heightens emission control system durability Enhanced protection against oxidation for more efficient operation Increased shear stability for better viscosity control & optimal oil pressure Improved oil aeration | Prime Automotive Warehouse Heavy-duty Diesel Engine Oil, SAE 15W40 - Gallon