I personally would rather spend a little extra and get oil from a known brand. This is what I got, it's very cheap at the moment too. Castrol Edge 4L 5W-30 Engine Oil: Amazon.co.uk: Car & Motorbike
Sorry pal but this oil doesn't carry the 505.01 or the 506.01 spec as recommended by Audi for fixed service or long life service, respectively, for PD engines. 507.00 is the latest VAG long life spec but the due to the age of of our B6s, you won't see it in the manual. I'm sticking to what the manual says! As I posted above, Castrol Edge TURBO DIESEL is what you want, identified by a black cap as opposed to the red cap.
See here or full VAG oil specs
This does carry the VW 507.00 which is suitable for PD engines. As mentioned here Castrol EDGE 5W-30 FST fully synthetic engine oil
If you use the oil finder on the Castrol site you will see it also recommends this oil for PD engines as well as the 5w40 spec Edge.
Cheers guys, i am not using the car on longlife servicing every 10k for me