Using your K&N air filter is easy. First, locate your vehicle's factory air box. Open it up and take out the old air filter. Then, simply place the K&N filter in the same spot. Make sure it fits snugly and close the air box. When it comes to maintenance, check the filter regularly. If it looks dirty, you can wash it. Use a K&N filter cleaning kit, following the instructions on the kit. Let the filter dry completely before oiling it with K&N filter oil. Apply the oil evenly. A well - maintained filter will keep your engine running smoothly. Also, always keep the filter away from sharp objects that could damage it.