Air filters have a critical part in delivering maximum power to your engine by allowing airflow and keeping harmful contaminants out of your intake manifold and valve train. Generally, it is recommended you change the air filter every 10,000 to 15,000 miles or 12 months, whichever comes first. However, if you drive in areas with high traffic volume, you might want to consider changing it every 6,000 miles. Over time, the air filter can get clogged, which can affect the overall performance of your car. Make sure you know the warning signs of a failing filter so you can have a better sense of when it should be replaced.