Mobil 1 5W40 Turbo Diesel Truck Synthetic Motor Oil (1Qt)

Mobil 1 has built a solid reputation in the synthetic oil space, and their Turbo Diesel Truck 5W-40 is specifically blended for the demands of diesel engines. Whether you are running a Cummins, Duramax, or Power Stroke in your pickup, this oil is formulated to handle the higher combustion pressures and soot loads that come with diesel operation.

As a full synthetic 5W-40, it flows well at cold temperatures for easier starts on winter mornings while maintaining a stable viscosity under the high heat that turbo diesel engines produce. The formulation focuses on thermal and oxidation stability, which means it resists breaking down and forming sludge or deposits even under extended drain intervals. It also meets the API SM specification, so it can pull double duty in mixed fleets where gasoline engines share the shop with diesels.

This is a 1-quart bottle, useful for topping off between changes or for owners who prefer to buy oil by the quart rather than the gallon.