The Audi A6 C8 (and S6/RS6) generally operates on a Flexible Service Interval (determined by the car's computer) or a Fixed Interval (Time/Mileage), whichever comes first.
All of Minor Service, plus:
If your A6 has the adaptive air suspension: audi a6 c8 serviceplan pdf
For a generic overview (non-VIN specific), several Audi forums host the factory PDF. The Audi A6 C8 (and S6/RS6) generally operates
Dealers love to bundle an "Inspection" every 30,000 km. But the PDF breaks it down into scope of work. Most of it is visual checks (wipers, lights, tire tread). You can perform 80% of these yourself. The PDF gives you the power to say: "No, I don't need a $500 'multi-point' for things I can see with my phone flashlight." Dealers love to bundle an "Inspection" every 30,000 km