Hi yes I agree with what you say in principle but the poster was asking what are the likely problems owning that model within a certain year band, the problem I quoted will happen at some point I had three coolers over 270k and it did not matter how much chemistry/care I lavished on the car that problem still persisted, there are legions of posts on this site about adblue and cooler problems its an inherent flaw with Audi A4/A6 within those years which is very much peculiar to the brand, you can't generalise its VAG engineering, no its Audi engineering, dont get me wrong I loved my car but over the miles the costs are prohibitive, ask yourself the question why are these cars being sold at around 80k, answer its around 80-100k the real fun and expense begins, I now have a VW Passat as a cab had it from 60k now on 100k and in terms of reliability and part costs it knocks spots off of the Audi and I would say in sports mode very little to choose between the two power wise as you are not dragging along all that weight.
Steve.