The C5 platform A6 has both a belt and two chains. The belt runs from the cranshaft to a pulley for each bank of cylinders. The pulley drives a chain which spins each chamshaft, so it's more like a belt-chain hybrid system.

The C6 platform A6 is a chain for both applications. They're still using the belt on some smaller displacement models (the 2.0TFSI), but it's chain in the big guys.


Got my info here:
http://www.bentleypublishers.com/tech/audi

If you look at the recommended service intervals, the line for the timing belt disappears after 2005, except for a footnote about the 2.0. All of the other service interval sheets show the timing belt change.

Of course, I've never had the pleasure of digging into a C6, so if an Audi tech needs to correct me on this, please go ahead and correct me!

-Red

 

Third time - the C6 (at least in the state side engines) have a chain.

 

Thats good to know that I dont have to deal with a timing belt.