What is the best strategy for maintaining a clean engine in my Audi A4?

I recently purchased a used Audi A4 and want to make sure I am taking proper care of the engine to ensure longevity. What steps should I take to keep it clean and functioning at its best?

Regularly changing the oil is essential for keeping your Audi's engine clean. Aim to change it every 5,000 miles or as recommended in your owner's manual. Also, consider using synthetic oil for better engine protection and performance.

In addition to oil changes, using high-quality fuel can also help keep your Audi's engine clean. Look for gas that is free of additives and has a higher octane rating. Avoid filling up at gas stations with old or dirty pumps.

Investing in a quality air filter can also help maintain a clean engine. Consider upgrading to a reusable, high-performance air filter that can be cleaned regularly instead of replaced.