Why is my Audi 80 engine making loud knocking noises?

I recently noticed that my Audi 80's engine has started making loud knocking noises while driving. The noise seems to increase with speed and is most noticeable when the engine is cold. Can someone help me understand what might be causing this and how to fix it? Thank you!

The loud knocking noise could be due to a problem with your engine's bearings. It is important to have this looked at by a mechanic as soon as possible as ignoring it could lead to further damage and expensive repairs down the line. My advice would be to take your car to a trusted mechanic for a proper diagnosis and necessary repairs.