My 01' 1.8T uses the 505-01 Synthetic Oil recomended by the Manufacturer.
But I have read this Technical Service Bulletin
http://www.audiusa.com/etc/medialib/....0023.File.pdf
As I don't know if anybody has posted this site or not. It is the Audi Oil Quality Standards (Audi is the Man. of VW) Revised April 16, 2009.
Please take a look at this and find the Oil Manufacturer that you prefer and it will list the oil that you can use. I can order the 505-01 but it will cast about $25 per quart. I use Mobil 1 Full Synthetic 0w40. It is great, and only about $7 per quart. Please let me know what you think. Thanks!!