What are common maintenance issues in the Audi A6?

I have recently purchased an Audi A6 and want to make sure I am aware of any potential maintenance issues that may arise. Are there any common issues that I should be aware of? How can I prevent these issues from occurring?

One common maintenance issue in the Audi A6 is with the engine oil cooler, which can cause leaks if not properly maintained. To prevent this issue, be sure to regularly inspect and change the engine oil and replace the engine oil cooler if necessary.