How do I properly maintain the Audi A4's engine?

I just purchased a used Audi A4 and want to make sure I am properly maintaining the engine. What steps should I take to keep it in good condition?

Regularly change your oil and filter every 5,000 miles to keep the engine running smoothly. Also, make sure to check your oil levels and top off as needed.

In addition to regular oil changes, be sure to use a high-quality synthetic oil to ensure optimal performance of your Audi A4's engine.

Regularly cleaning and replacing your air filter can greatly improve your engine's performance and longevity. Check your owner's manual for recommended maintenance intervals.