What is the function of the Audi 80's timing belt?

I am a new Audi owner and I am curious about the importance of the timing belt in my Audi 80. What does it do and how often does it need to be replaced?

The timing belt is a crucial part of your Audi 80's engine that controls the opening and closing of the valves. It needs to be replaced every 60,000 to 90,000 miles to prevent potential engine damage.

The timing belt ensures that your engine's pistons and valves are in sync, and it needs to be replaced before it shows visible signs of wear to avoid potential engine failure.