Why does my Audi 80 engine make a knocking noise at startup?

I recently noticed that my Audi 80 engine has been making a knocking noise when I start it up in the morning. It seems to go away after a few minutes of driving. What could be causing this and what should I do about it?

The most likely cause of this knocking noise is low oil pressure. It could be due to a clogged oil pump or filter, or it could be a sign of worn engine bearings. I would recommend getting your oil pressure checked and having any necessary repairs done.