Using the correct type of oil is equally important. If your 6.7 Power Stroke is a workhorse like most diesel trucks, Ford suggests Motorcraft 5W-40 fully synthetic oil regardless of the ambient ...

Ford has supplied an SAE viscosity grade chart for the 6.7 Power ... Ford recommends Motorcraft 0W-40 diesel oil. For severe duty uses, the best oil for your Ford 6.7 Power Stroke is Motorcraft ...