What causes unusual engine noises in an Audi 80?

I recently noticed some strange noises coming from my Audi 80's engine. Can you give me some insight into what may be causing this and how I can resolve it?

One possible cause of unusual engine noises in an Audi 80 could be worn out bearings in the engine. This is a common issue in older cars and can result in loud knocking or clicking sounds. It's important to have this checked and repaired by a professional mechanic as soon as possible to avoid further damage.