See more from Ask Carzone 
When to change a 191 Audi A6's belt?
191 audi a6 time belt when should i change it
Our answer:
Hi Martina,
Assuming it is powered by the popular 2.0 TDI engine, then the interval is at least every 210,000km, regardless of time. If the car has a different engine come back to us and we'll look it up.
Have a motoring question? Ask us here!
Ask us anything motoring related and please provide as much information as possible so we can give you the most accurate advice.