Here is the buying guide for the Audi Q7 TDI.
http://www.myturbodiesel.com/1000q/q...-forum-faq.htm
It includes lots of stuff that you won't find in video reviews and technical diagrams and cutaways. Also included is a chart comparing it to the BMW X5 diesel, VW Touareg TDI, and Mercedes ML and GL Bluetec diesels. The second half is in the members only section and can be viewed in this post.
2009-2011 Audi Q7 TDI buying guide and FAQ, part 2