Shell Rotella T4 Triple Protection 15W-40 diesel engine oil provides significantly better wear protection than previous generation oils to maximize engine efficiency and prolong engine life in a wide range of heavy-duty engines. It uses advanced additive technology to protect under the most severe conditions found in modern, low-emission engines and older hard-working diesel engines. Shell Rotella T4 15W-40 engine oil provides enhanced deposit protection to help keep engines cleaner over the oil drain interval. It effectively sustains emissions control compatibility with an exclusive low ash formulation that helps protect the exhaust catalysts and particulate filters found on the latest low-emission vehicles. Plus, it provides enhanced shear stability performance for viscosity control and optimal oil pressure in your engine. Shell Rotella T4 15W-40 has a proven legacy of performance and is suitable for a wide range of heavy-duty engine applications, including on-highway fleets, general haul, agricultural, mining, logging, construction, diesel pickup trucks, and vehicles requiring resistance to increased heat and stress.