While waiting at the Ford store this morning to pickup a $3 part that was going to cost me $31 I happened to look at the oil they had on the shevles. Cases and cases of Motorcraft oil in 2 viscosities only. 5W-20 and 15W-40. I wonder what they put in the 4.0L V6's? Any guesses? I also overheard a service guy talking to a local tire shop. "Yea, those tires we called about yesterday? Yea, we need them. 215 75R 15 and SL whatever those letters mean..." Next time your vehicle has to go to the dealer, be afraid. Be very afraid.