Hello mate, depends what VW oil you mean, you want to use Quantum Longlife 3 5w30, it's cheap-ish, depending where you go... It's £25-35 for 5 litres if you negotiate with the dealer (or try TPS they will do it for cheap).
I've always used the Quantum oils on my previous SEAT's, that said, a lot of people on here use Castrol EDGE 5w30.
You won't go wrong with either, whichever you can get the best deal on :)