How do I properly maintain the air filters in my Audi A6?

I recently purchased an Audi A6 and I want to make sure I am properly maintaining it. How often should I change the air filters and what signs should I look for to know when it needs to be replaced?

You should change your air filters every 15,000-20,000 miles or every 2 years, whichever comes first. Signs that your air filter needs to be replaced include decreased fuel efficiency, unusual engine sounds, and a dirty appearance.

As a general rule, it's a good idea to check your air filter every time you change your oil. However, if you drive under severe conditions (dusty roads, heavy traffic), it may need to be changed more frequently.

It's important to keep your air filters clean and free of debris to ensure proper airflow to your engine. Make sure to follow the recommended maintenance schedule in your Audi A6 owner's manual.