Being in the process of going through the fuel injector fault on my 2.0 TDI 170 its seriously leaving with thoughts of future replacement. The 140's are suffering with balance shaft failure and rules them out plus it would be a step backwards in performance. I dont know why but the A4 Avant is what i always wanted and love it but this fuel injection problem has been expensive. I must admit i fancy a V6 TDI, not sure in what guise 2.5, 2.7 or 3.0? Do these suffer from any major engine/mechanical problems that the 2.0 are currently suffering?