Audi has it's own ATF, and the year model will dictate which fluid you must purchase from the dealer (for around $20.00 per Qt)
You need to do an in-depth diagnosis of the problem to determine the cause, and repair it.
The right types of fluids have to be in the car to keep it running smoothly. A 2003 Audi A6 Quattro 3.0 uses 5W-40 engine oil.
my 02 A6 3.0 Quattro holds 6.5 quarts and I only run synthetic in it
4.5 quarts
About 5.25 with filter.
Were is the plug to put transmission oil for 1999 a6 audi?
5w30- check owner's manual. I run synthetic in my A4 2.8.
Underneath the engine, toward the right.
Use Exactly what Audi recommends as written in your owners manual. You listed no year so I would only be guessing.
19mm socket for the oil drain plug and a oil filter wrench if your not manly like me
The 2002 Audi A6 Quattro was built in a 2.7L & 3.0 V6 and a 4.2L V8 only. If the engine was the 2.7L V6 engine oil capacity with filter is 6.9 quarts of European synthetic 0W40 or 5W40.