Wow it's been long since I ventured here. I currently have 07 2l tdi A4 and I've just put a deposit down on a 2013 BiTDI A6 and I'll be viewing it this weekend. It's currently being prepped with a service and some minor paint work touch up. It has the following spec: - Tech Pack - 20" alloys - Lighting pack - Bose - Sports Diff - Privacy Glass and black on black interior. The part I'm nervous about, is that it has done 100k and I hope it's been taken care of. My current A4 has done 166k without any mechanical issues. A few questions for you all: 1) How regular are the belts done on A6 bitdi and oil for the gearbox? I'm struggling to find a definitive answer. 2) If I swapped the alloys to rotors, are factory options to be declared to insurance? Also any advice on pre-checks?