Best overall is the 3.0TDI - the biturbo version is a beast. The 2.0TDI is ok but has issues with balance shafts, but is quite frugal.
For petrol engines, the 3.0 TFSI supercharged V6 is excellent. There is a 2.8 FSI V6 but tbh I'm not even sure we got that here. Other than needing their intakes cleaned from time to time, I've not heard of any significant issues with the FSI V6s.
|