oil used must be VW approved 502.00 rated and is synthetic. Two main brands being used here is Castrol Syntec 5w40 and Mobil 1 0w40. My dealer uses the Castrol and charges $7 a quart which is about what the local discount auto parts place charges. If you didn't like the $75 5k service you won't like the 10k which is double that and the 20k which cost me over $400.