I’m sure it’s been covered but
- It’s a belt
and
- It sure as shit won’t cost $400 in labor anywhere that you’d actually want to have the job done.
The 30v 2.8 is one of the best motors audi has made in a while, it’s a tank, and should have no problem going to 200k w/ proper oil changes and timing belt refreshes. However, they can leak a bit.