Do you mean your cars engine air intake filter? If so it is recommended to change them anywhere from every 7000 to 25000 miles depending on your location and how much driving you do. If you have your cars owners manual it will explain when you should change the filter for your particular make and model. I change mine every 15000 or 5th oil change. When in doubt it never hurts to change it after all a car needs to breathe just as bad as we do!How often is it recommended to change out a cabin air filter?
Depends on how dusty the area is where you are. I change mine once a year and I live in New England near the city.
