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An engine air filter is designed to remove things like dust, dirt and grime from the intake air required to cool the engine and help it to run efficiently. Similarly, the air filter in the cabin of your vehicle is designed to make sure nothing gets into the cabin of the car that you shouldn't be breathing in. How often you replace these two air filters is entirely dependent on the relative conditions you drive in, but experts suggest replacing them once every 3 years or 30,000 miles.