What causes excessive engine oil consumption in an Audi A6?

I've noticed that my Audi A6 goes through a lot of engine oil, is this normal and what could be the cause?

Excessive engine oil consumption can be caused by a variety of issues, including worn piston rings, valve stem seals, or a faulty PCV system. It's important to have it checked by a mechanic to accurately diagnose the problem and prevent potential engine damage.

In some cases, excessive engine oil consumption can simply be due to driving habits, such as frequently accelerating or braking harshly. Try adjusting your driving style and monitor your oil consumption to see if it improves.