I have a late 2005 A4 facelift model 1.9TDi SE which I am considering trading in for a new model 2.0TDi A6. I would appreciate advice on the reliability of the new A6 vis a vis the A4, which has been second to none - I have heard some scare stories about the Audi 2.0TDi engine and would like to get feedback on it before I go looking around. The main reason I'm looking into changing is for the extra space in the A6 for family etc. Thanks