Mobil 1 Turbo Diesel Truck Motor Oil 5W-40 Exceptional resistance to high-temperature varnish and low-temperature sludge deposits to help keep engines clean. Its wide viscosity range provides outstanding protection consistent with an SAE 40 grade oil at high temperatures, combined with the easy cold-start performance of a 5W rated oil. Meets CI-4, CH-4, CG-4, CF-4 and CF. Is recommended for diesel-powered pickup trucks built by Ford, General Motors, GMC and Dodge. Meets diesel engine requirements of Cummins, Powerstroke, Duramax and Navistar