How often should I change my air filter?

Knowing when to replace your air filter largely depends on what type of driving you do and how much dirt your air filter ingests. Based on the type of driving you do will dictate how often you need to change your filter. City drivers should change their air filters every 15,000 to 30,000 miles or once a year for preventative maintenance. People that live in the country or drive on dirt roads, however, may need to change their air filters more frequently.