I would add to the above that changing oil at 3000 miles with dino oil is better than changing oil at 5000 - 6000 miles with syn. oil. It's the soot, etc. that wears the engine and gets stuck in the piston rings. I believe that it is Larry who says "Change it hot and change it often." (Yes, if I lived in Alaska, I would have to use syn. oil.) Have a nice day.