Hey I know theres not an exact amount, it is more or less fill till the fluid begins to trickle out. Well I want to order some gear oil and I need a good ball park estimate how much I need. Thanks in advance. This is for a '96 A6 quattro 4-speed auto...by the way, I want to replace oil in both cases. Thanks.

If so, I think the book quote is something like 2.7qts for the ATF. I would get a couple quarts of Redline Synthetic 75/90 for the front, middle and rear diffs. You'll have to suck out the front one, as there is no drain.