i put a 10w-30 in my truck last winter and it started alot better than the 5w-40 i run in the summer. It was Rotella tho...not mobil 1. I don't drive my truck in the winter...i just start it up from time to time and the thinner oil makes it start and idle better when cold. I plan on putting in some amsoil 5w-30 next month
A forum community dedicated to Ford Power Stroke owners and enthusiasts. Come join the discussion about diesel performance, modifications, EGR deletes, troubleshooting, lift kits, tires, wheels, maintenance, and more!