Using your K&N air filter is easy. First, open your vehicle's factory air box. Then, simply remove the old air filter and drop in the K&N replacement filter. Make sure it fits snugly. When it comes to maintenance, it's recommended to clean the filter every 50,000 to 100,000 miles, depending on your driving conditions. To clean, use a K&N air filter cleaning kit. Gently wash the filter with the cleaner and let it dry completely before re - oiling. Be careful not to over - oil the filter as this can reduce its effectiveness. Always follow the instructions on the cleaning kit. Also, store the filter in a clean, dry place when not in use.