I remember I started a similar thread a couple of years ago, I thought I had a leak. I then took it to VW who said there was no leak and all was within normal range. VW and Audi engines seems to use a lot more oil than many other brands for whatever reason, particularly when the engines get a bit older.
Also the oil warning light sometimes only comes on when there is pretty much no oil left so I would make sure you are regularly checking it yourself and always keep oil spare!