Using your K&N replacement air filter is easy. First, locate your vehicle's factory air box. Open it up and take out the old air filter. Then, simply drop in the new K&N filter. Make sure it fits snugly in place and close the air box. When it comes to maintenance, you don't need to replace the filter often. Just check it regularly. If it looks dirty, you can wash it. Use a K&N filter cleaning kit, follow the instructions on the kit to wash the filter gently with water and the provided cleaner. Let it dry completely and re - oil it with K&N filter oil before putting it back in the air box. Remember, don't use any other type of oil as it might damage the filter. Also, always make sure the filter is completely dry before re - installing it to avoid any engine problems.