Sandy, Go for your local Garage not the dealers, their overheads are a lot, insist what you want doing & ask them to make sure are approved Audi Parts/ Filters, I have tried to advise the same as others on here regards getting ripped off, I would show them the service book & state that you want the service to follow Audi's recommend route, one the service data on the dash has been updated & logged, you then have the prof in case you decide to sell, providing any car is serviced right, the right parts / oil/ filters/ on the date recommend your car will keep it's value.