Why is my 1990 Audi 80's engine making a ticking noise?

I recently bought a used 1990 Audi 80 and noticed that the engine has a constant ticking noise. It doesn't seem to affect the performance of the car, but it's quite loud and I'm not sure if it's something I should be concerned about.

The ticking noise could be caused by several factors such as low oil pressure, worn bearings, or a faulty valve lifter. It's best to have a mechanic inspect the engine to pinpoint the exact cause and address any potential issues.