hi hope someone can help im a vw virgin and have been struggling to get info on the servicing needed for my vr6 basic engine and oils no probs auto gear oil no probs top up system a pain but not a prob had the car plugged in to a computer its telling me a charcoal filter needs changing ?????? what is it and were is it. next prob with it being 4 wheel drive does it have a transfer box connected to the auto box at the front i can see the rear trans box??? what oil do they take and if i remove the front drive shafts (they need new inner boots fitting) will the oil come out the local vw dealer is