Why is my BMW 5 Series engine making a loud ticking noise?

I recently purchased a used BMW 5 Series and noticed that the engine is making a loud ticking noise. This only happens when the engine is cold and goes away once the car has been driven for a few minutes. Should I be worried about this noise? Is it a common issue with BMW 5 Series engines?

This could be an indication of a potentially serious issue with your engine. It is not a common issue with BMW 5 Series engines, so it's important to get it checked out by a professional mechanic as soon as possible.

I had the same issue with my BMW 5 Series and it turned out to be a loose valve. It's not a serious problem, but it's always better to have it checked by a mechanic to avoid any future complications.