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Air filters on automotive vehicles are important for the reason in that they filter sand, dirt, and other particles from entering the engine and damaging the motor. Typically the small particles can cause cylinder wall erosion as well as allowing build up to form in the intake runners as well as the head, causing issues with combustion and efficiency. It can also affect the ignition system by allowing excessive dirt build up to form on the spark plug causing cylinder misfiring.

On most EFI (Electronic fuel Injection) equipped vehicles, a sensitive sensor referred to as a MAFS (Mass Air Flow Sensor) can become dirty without a filter. It's important because it tells the engine how much fuel is needed for the amount of air entering the engine.

Air filters are important for motor longevity so as such, most paper media filters should be replaced every oil change. Wet and Dry cotton media filters should be cleaned, dried, and reoiled (exception of course pertaining dry media filters) whenever necessary as many have a longer service life than most paper media filters.

Not servicing or maintaining your filter can reduce engine mileage, power and efficiency. Running your vehicle without a filter damages metering sensors, affecting efficiency and power as well as encouraging premature engine damage and eventually failure.

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Q: Why do cars need air filters?
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