Ford recommends Motorcraft 10W-30 Super Duty diesel motor oil. If the ambient temperature reaches -22.0°F or below, Ford recommends Motorcraft 0W-40 diesel oil. For severe duty uses, the best oil ...
Most are transitioning to SAE 10w-30, but depending on equipment builder ... Viscosity is only one aspect of a heavy duty diesel engine oil. There is a complex mixture of various performance ...