A clean air filter helps to keep damaging particles from entering your engine and causing increased engine wear. Dirty air filters restrict air flow which can contribute to decreased acceleration, horsepower, and reduced overall performance. Experts at FRAM engineering laboratories recommend changing every 12,000 miles. **Need help finding the right engine air filter model for your vehicle? Click Here A clean air filter helps to keep damaging particles from entering your engine and causing increased engine wear. Dirty air filters restrict air flow which can contribute to decreased acceleration, horsepower, and reduced overall performance. Experts at FRAM engineering laboratories recommend changing every 12,000 miles.