Hi, we are currently looking at changing our BMW 330d Touring to a larger car and the A6 is one of the cars on the list to look at. I have had many VAG cars (S3, Leon CR etc.) but they all went when the family started so I am a little out of touch with some of the later VAG stuff. My main question's are, what are the differences on the 225 and 233 tdi engine?, ie is it a later type of engine or Audi just gave it a software update for the extra power?, and if I go for a Quattro is it reliable? Also if I did go for a petrol it looks like the A6 had a 2LT FSI engine as an option but only 170hp, not the 200hp that all the other VAG cars had with one. Also as I plan to get a remap would an auto be better? or are clutches ok. I know the later BMW 330d's can make 290hp/620nm and if its an auto the clutch's just don't last, the 335d twin turbo never came as a manual due to this problem. Any advice will be greatly appreciated.