Shell Rotella T4 Triple Protection 15W-40 diesel engine oil provides exceptional wear protection for longer life in a wide range of heavy-duty engines ? from diesel pickup trucks to tractors to tractor-trailers. It uses advanced additive technology for superior engine cleanliness throughout the oil drain interval to protect under the most severe engine conditions found in modern low-emission engines and older hard-working diesel engines. Shell Rotella T4 15W-40 engine oil provides deposit control that helps keep engines clean for optimum performance and long life. It effectively sustains emissions control system durability where diesel particulate filters and after-treatment systems are used. Plus it provides enhanced protection against viscosity loss due to shear and improved oil aeration compared to the previous formulation. Shell Rotella T4 Triple Protection 15W-40 is an excellent choice for on-highway fleets general haul construction agriculture public-transport operators diesel pickup trucks i