How do I keep my Audi A4's engine running smoothly?

I just bought a used Audi A4 and want to make sure the engine stays in top condition. Any tips or maintenance suggestions?

It's important to follow the recommended maintenance schedule and get regular oil changes to keep your engine running smoothly. Also, be sure to use high quality fuel and avoid idling for extended periods of time.

Make sure to regularly check and replace your air filter, as a clogged filter can decrease performance and fuel efficiency. And don't forget to also check and replace your spark plugs every 30,000 miles.

In addition to regular maintenance, consider using a fuel system cleaner every 6,000 miles to keep your engine's components clean and working properly.