Probably a version of Castrol SLX, Longlife II, 0w-30, unless it's still A3/B4 rated. A factory fill on many Vw/Audi engines - both gas and diesel.
It's very easy to check - just do a VOA and look at the vis @ 100C. If it's < 11.0 Cst, it's an ACEA A5/B5 formulation like Mobil 1....
TS