Using your K&N air filter is easy. First, open your vehicle's factory air box. Then, take out the old air filter and place the K&N filter in its spot. Make sure it fits snugly and close the air box. As for maintenance, check the filter regularly, especially if you drive in dusty conditions. When it gets dirty, you can wash it. Use a K&N filter cleaning kit, follow the instructions on the kit to gently wash the filter. After washing, let it dry completely. Then, re - oil the filter using K&N filter oil. Remember, don't use other types of oil as it may damage the filter. Also, always keep the filter clean to ensure it performs at its best and lasts for the whole lifespan of your vehicle.