What is the most common cause for engine failure in Audi A7?

I have recently purchased an Audi A7 and want to understand the most common engine failure issues that I should be aware of. I have heard about a few common problems but would like some expert advice.

One of the most common causes for engine failure in Audi A7 is oil sludge buildup, which can lead to serious damage if not addressed.

Another common issue is timing chain failure, which can be expensive to repair and should be taken care of as soon as possible.