Using your K&N air filter is easy. First, open your vehicle's factory air box. Remove the old air filter and place the K&N filter in its spot. Make sure it fits snugly. Close the air box and you're good to go. As for maintenance, keep an eye on the filter's dirt level. When it looks dirty, it's time to clean it. You can use a K&N cleaning kit. Just follow the instructions on the kit. Avoid using harsh chemicals as they can damage the filter. Also, always let the filter dry completely before reinstalling it. With proper care, your K&N filter will last for the whole life of your vehicle.