I have done my services from Audi and VW for a long time now (Princeton). Recently I found that I probably was being ripped off from service side.
1. My Golf diesel (it has been returned to VW), dealership forgot to reset the service reminder.
2. My Audi A4 wagon, engine oil pressure light came up.
In both time, they fixed, I suspect that they never changed the oil, other than charging me 350$ for the scheduled maintenance. Princeton Audi found, no leaks, no problem, but mysteriously the oil pressure was low and they topped it apparently.
I would never be going back to this place anymore.