One of the main reasons I hate diesels is the noise and vibration inside the cabin. I have now narrowed down my choice to a Mercedes C320 Diesel (2008) and an Audi 2.0 TDi (2009) S-Line Multi-Tronic (yes I plan to take out an extended warranty)... I have driven the Merc and the only time I really heard the sound of agriculture was when the engine was cold. The cabin was really well isolated from the sound and vibrations. Is this the case for the Audi too? I've spot the perfect one but to save myself the 168 mile trip I thought I would ask first... Thanks for any input.