quote:I really wonder if this is true Both dino and syn oils will be pretty close to 3500 cP at -20 C. I agree once you drop below that number than the 10W syn will do much better in comparison. So in Pa. I am comfortable to run the 10W-30 Mobil at say -15 F. and of course the 10W-30 Dino will be jelly here. But if you use the proper "W" grade (0W, 5W)- why would you see a difference in wear??
Originally posted by Patman: If you live in a cold climate, then yes, you will see less engine wear if you run synthetic oil over dino, even with 3000 mile changes.