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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
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)
About 5.25 with filter.
4.5 quarts
Underneath the engine, toward the right.
5w30- check owner's manual. I run synthetic in my A4 2.8.
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.
Take the plastic skid plate off the bottom and you will have easy access.
Depends on model year, driving style and climate but in general 5w30 or 5w40 synthetic.