Description Shell Rotella T4 Triple Protection 15W-40 diesel engine oil provides exceptional wear protection for longer life in a wide range of heavy-duty enginesâ 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, including high-power vehicles where resistance to increased heat and stress is required.