Using your K&N air filter is easy. First, locate your factory air box under the hood of your Dodge Ram. Open the air box by removing the clips or screws holding it together. Take out the old air filter and put in the K&N replacement filter. Make sure it fits snugly in place. Then, close the air box and secure it. As for maintenance, it's recommended to check the filter every 10,000 - 15,000 miles. If it looks dirty, you can wash it. To wash, use a K&N filter cleaning kit. Spray the cleaner on the filter and let it soak for a few minutes. Then, rinse it gently with water until the water runs clear. Let the filter dry completely before re - oiling it with the K&N filter oil. Be careful not to over - oil the filter. Remember, this filter is backed by a warranty, so keep your purchase receipt. Avoid using harsh chemicals on the filter as it can damage the media. Also, make sure to install the filter correctly to get the best performance from your vehicle.