The car in question is a 2003 model, which has been on variable service schedules since new. It has had a total of 3 services by an Audi dealer and in 166 miles time it will need another. The problem is that I'm not sure if I’m going to keep this car long term so would it be worth more if I stuck to an Audi dealer to service it rather the a good though not Audi specific independent workshop?