We are really sorry, but we don't have gearbox oil capacity for 2005 Audi A6 Avant C6 yet :(
If you have any technical data, service manuals, owner's manuals, etc. for 2005 Audi A6 Avant C6 don't hesitate to share it with our community. You will help a lot of people sharing knowledge you have.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Audi A6 Avant service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 2005 Audi A6 Avant you're not only saving money, but also also improving your technical skills and learning something new.
2005 Audi A6 Avant generations
In 2005 Audi offered 2 generations of the A6 Avant. Gearbox oil capacity may vary in different generations. Be sure that you are looking at the rigt modification.