Contemplating switching to synthetic oil. Saw lots of oil comparison charts and read all the posts in this thread and to be honest it's all greek to me. Which is the best one? I have a Schaeffer dealer just down the road from me, so that would be real handy. Is the Ford synthetic from the dealer any good? Thought they were already using synthetic until last oil change when I happen to be standing there and saw the guy dump conventional in. I have a fleet charge account so don't ever see a repair order just a bill at the end of the month.