Using your K&N air filter is easy. First, make sure your engine is cool. Then, open the factory air box of your 1986 - 1996 Mazda RX - 7 1.3L. Remove the old air filter and replace it with the K&N filter. Close the air box securely. When it comes to maintenance, check the filter regularly. If it looks dirty, it's time to clean it. You can wash it with a mild detergent and water. Rinse it thoroughly and let it dry completely. Then, re - oil the filter using K&N filter oil. Remember to always follow the instructions on the oil bottle. Also, keep in mind that this filter is backed by a 10 - Year/Million Mile Limited Warranty, but proper use and maintenance are key to getting the most out of it and keeping the warranty valid.