Engine protection and improved performance with a 12,000 mile tune-up air filter. Damaging particles may be entering a vehicle"s engine causing increased engine wear. Air filters can only hold a limited amount of dirt and when full there is potential for dirt to bypass the filter and seal and be ingested into the vehicle"s engine. Additionally, a dirty air filter can restrict airflow which can contribute to decreased acceleration, horsepower and reduced overall performance. That is why the experts at FRAM engineering laboratories recommend changing air filters every 12,000 miles!