Question: how to change automatic transmission fluid audi a6?
Answer: Using a Jack, place the car up on jack stands at a even level.
With the engine off, open the fill plug (17mm Hex). ... 
Next, open drain plug (8mm Hex) and let fluid drain.
Remove transmission pan bolts (T-27). ... 
Cleaned transmission pan with brake cleaner.
Remove filter bolts (T-45) and remove old filter.