Get yourself the Audi Service Manual by Bentleys. I bought mine on Ebay for $50 used. It will tell you every type of service your car needs, the total time to do the job, and at approx what mileage you should do it. The book is over 1000 pages with excellent diagrams of every part down to the nut and bolt with the part number. U can literally strip your car to nuts and bolts with this book. I have been ripped off by the Service department a few times. I would take my car in and they would advise service that I didnt need. Engine flush is a complete waste of money and not requried. Its Salesman talk. Even the book tells you that.
I get my oil chnaged synthetic at Sears for $40. Audi charges close to $100 for the same oil. Why pay $75 labor to chnage oil? Sears does brakes for $80 for front and $80 for back. Audi chnarges $580 for the front, and another $580 for the back. Sears charge $110 for the battery, $audi charges $285. Any engine, transmission etc I get Audi to do. Hoep that help, I gave u a mouthful there