The filters present in your vehicle are very important to keep road dust and other small debris out of the vehicle cabin, engine, fuel and oil system. The life of these filters is largely dependent on how much you drive, but more importantly where you drive. If you are in dusty or off road conditions mostly, then your filters should be changed more frequently as an example. Since each vehicle will be different, it's important to have your filters inspected by a professional to determine the condition of your filters.