https://www.sinclairaudi.co.uk/news/how-often-should-a-cambelt-be-changed-on-audi-a3/#:~:text=It is recommended that you,cambelt every 40%2C000-60%2C000 miles.
When Should Audi A3 timing belt be changed?
It is important your cambelt is changed at regular intervals to ensure optimum safety and performance of your Audi, it is recommended that your cambelt gets replaced every 5 years or 75,000 miles, whichever comes first.