Oil vesocity for 6.7 powerstroke
Looking at the specs for the 6.7, it says 10w30 for normal use. Also see that 5w40 synthetic can be used in severe duty apps. Has anyone switched over to 5w40 for normal use? Does it hurt to do so? I ...
Forum Discussion
Hannibal wrote:
Keep in mind that one of oils most important jobs is to carry heat away from bearings and pistons. Bearing clearances are the same regardless of viscosity. Thicker is not always better.
Lower viscosity = higher flow,= more removal of heat by oil. Subject to owner not flogging to unneccessary levels of abuse such that heat removal does not exceed barrier breakdown of oil film between moving parts, due to load limits being exceeded.
Make mine Mobil 1 Turbo diesel truck 5w-40, and if hauling heavy loads at high speeds, I spend the money and buy Mobil 1 Delvac-1 in 5w-40, it is a more durable product, the oil base stock is PAO based in Delvac-1. You are dealing with a $16,000 motor, or more, chintzing on oil, to me seems pennywise, and pounds foolish. Run Industrial strength commercial grade motor oil if towing fast, heavy and hard.
