Used to hear quite a lot of praise back in the day for Motorcraft, but I understand that for the price point, you can get a full synthetic. What I don't or have ever really heard about on this awesome site is AC Delco oil. What gives? Same deal as Motorcraft? Price issue? Mediocre oil? Availability outside of the dealer? Come to think of it, I see Motorcraft on the shelves but can't recall ever seeing AC Delco on a shelf outside of a GM parts department.