What does it mean if my Audi 80's engine is making a knocking noise?

I recently noticed that my Audi 80's engine is making a knocking noise. It doesn't seem to be affecting the performance of the car, but I'm worried it could be a sign of a bigger issue. What could be causing this noise and should I be concerned?

It's possible that the knocking noise is caused by a lack of oil or dirty oil. It's important to regularly check your oil levels and get an oil change every few thousand miles to keep your engine running smoothly.

Another possible cause of the knocking noise could be worn out engine bearings. This can be a more serious issue and should be checked by a mechanic as soon as possible to prevent any further damage to the engine.