Most air filters should be replaced at least every 15,000 miles, depending upon driving conditions. The air ﬁlter traps dirt particles, which can cause damage to engine cylinders, walls, pistons and piston rings. It plays a role in keeping contaminates off the airﬂow sensor in fuel injected cars, which reduces excessive engine wear and improves fuel economy.
A clean air filter will help:
Improve gas mileage and engine performance.
Protect the life of the car engine by ﬁltering out dust, contaminants and foreign objects.