I have been reading and lurking around this site for some time. I was hoping to see some compelling evidence to suggest that synthetic oil will protect your engine better than conventional motor oil. I hate to admit this, but I think I am swinging the other way. I have been a devoted user of Mobil 1 for years, but now I have come to the conclusion that todays new conventional oils will offer excellent protection for those who stay within recommended OCI's. It would be interesting to see some comparisons of the same car/engine with synthetic versus dino oil. In the long run, I think that a good maintenance schedule is all that really matters. I have seen posts of cars going over 400,000 miles on just dino oil and consistent maintenance. I feel like a traitor...but I cannot dismiss the information I have soaked up here. Thanks everyone. This is a great site.