Why is the engine of my Audi 80 making a strange noise?

I recently noticed that the engine of my Audi 80 is making a strange noise. It's a mixture of a rattling and squeaking sound. What could be causing this and how can I fix it? I don't want to risk damaging the engine further.

It's possible that there is an issue with the timing belt. This could be causing the strange noise and if left unresolved, it could lead to further damage to the engine. I would recommend taking your car to a trusted mechanic for an inspection and possible replacement of the timing belt.