I've been searching exactly the same thing for a fellow member, Conquistador. Also came close to writing a post. Here's what I know so far.
Audi Service advised the oil they use is Castrol 0w30, Longlife conforming to 504.00 and 507.00.
Audi Parts advised 0w30 or 5w30 to similar specifications.
Halfrauds and Euro Car Parts website gave all different specs and viscosities, but seemed to fall around 5w40.
I work for a Seat/Skoda Main Dealer, and we use Quantum. In the workshop, for petrol engines we use 5w30 on Longlife Servicing. When I checked the bottles, they conform to 504.00 and 507.00. The bottle also says "Manufactured by Volkswagen etc....".
So a long story short, if you can find the right viscosity, use Quantum, since it's made by the same people who make the car.
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