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5w30- check owner's manual. I run synthetic in my A4 2.8.
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.
About 5.25 with filter.
4.5 quarts
if you cant get the car on ramps forget it
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.
Most likely it is the headgasket being blown. Check the coolant level. If there is oil in the coolant and water in the oil there is your clue.
Take the plastic skid plate off the bottom and you will have easy access.
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)