Seems a daft question but..
Not my car but my mum's. She has an A8 (would post on that forum but seems a bit dead...) and asked me to sell it for her. As far as I know its not a quattro, it's MY2005, 3.0 V6 petrol (I don't think they did that as a quattro), but it does have a quattro badge on the passenger dash (same as on my S4). I am not near the car so can't get under and look, so any easy way to find out on the internet from reg or anything?