The TDI's are a great option if you find one with some diesel-gate warranty left. I'm currently looking for one myself. But what scares me about these is the HPFP failure, and subsequent contamination of the entire fuel system. Regarding the 3.0T engines my big worry is the timing chain guides & tensioners - not an easy fix since all of the components are at the rear of the engine. Other than this...from what I've read the 3.0T engines are quite reliable.