Using the K&N air filter is easy. First, open your vehicle's factory air box. Remove the old air filter carefully. Then, simply drop the K&N filter into the air box. Make sure it fits snugly. When it comes to maintenance, the filter is washable and reusable. You can clean it every 50,000 - 100,000 miles depending on your driving conditions. To clean, use a K&N filter cleaning kit. Apply the cleaner evenly on the filter, let it soak for a few minutes, then rinse gently with water. Let it dry completely before re - oiling with K&N filter oil. Be careful not to over - oil the filter as it can damage your engine. Also, always check the filter regularly for any signs of excessive dirt or damage.