1.9 can be variable service too; giving over 20K if you mainly do mostly motorway. I buy AUDIs at 3 years old, one owner, ex-company cars with 90-100k miles and stick another 80ish on them (trade them out before stumping up for cam belt). My last A6 2.5 needed only a replacement rear wiper motor over and above service consumables (pads, tyres etc.) I drop less than 25% selling them on; I doubt there is a more economical option out there.