Thanks Benzmac - I live in Houston County, Ga. and will take a look at the AST unit. My goal is to be able to do all my own work like I have been doing on my autos for the past 20 years.
I was looking at purchasing a VW TDI Jetta (new) and this E320 came available at the Mercedes dealer in Macon. After I took the wife for a test ride in both cars she said she like the E320 better (imagine that). I am easy on it and get right at 26 miles to a gallon milage (It will haul butt when necessary though). I am very happy with this automobile and hope to get many years of good use out of it.