Engineered for both light- and heavy-duty applications, Mobil 1 Turbo Diesel Truck 5W-40 is a fully synthetic motor oil that helps to extend engine life while ensuring long drain capability and outstanding fuel economy in modern diesel engines. Appropriate for use in mixed fleet operations, this motor oil features inherent stay-in-grade shear stability that maintains viscosity and reduces wear on engine parts for longer, smoother service in severe, high-temperature applications. You'll spend less, go farther, and get more work done. | Mobil Turbo Diesel Truck 5W-40 Synthetic Motor Oil | Size 1 gal