Mobil 1 Turbo Diesel Truck 5W-40 is a full synthetic heavy-duty diesel motor oil that helps to extend engine life while providing long drain capability and potential fuel economy benefits* for modern diesel engines operating in severe applications. Utilizes state-of-the-art technology to help deliver exceptional performance and is recommended for use in all super high-performance diesel applications, including modern low emission engine designs with Exhaust Gas Recirculation (EGR), as well as refrigerated units and well-maintained engines. This formula provides thermal and oxidative stability to help prevent high-temperature deposits and low-temperature sludge buildup. Its exceptional low-temperature pumpability allows for easy engine start-up and helps to reduce wear. Mobil 1 Turbo Diesel Truck 5W-40 is recommended for use in a wide range of light-duty applications such as turbo diesel pick-up trucks, as well as heavy-duty applications and operating environments found in the on-road transport and off-road mining, construction, and agricultural industries. The performance of Mobil 1 Turbo Diesel Truck 5W-40 is the result of extensive cooperative development work with major equipment builders and the application of the latest lubrication technology. (*Compared to a 15W-40 conventional engine oil. Actual savings are dependent upon vehicle/engine type, outside temperature, driving conditions, and your current engine oil viscosity. To learn more about the Mobil 1 Limited Warranty, visit Mobil.US.)