Using this oil cap is a breeze. Just remove your old oil cap and replace it with this new one. It has a factory fit, so it should go on smoothly. Make sure it's tightened properly to avoid any oil leaks. As for maintenance, you don't need to do much. Just wipe it down occasionally with a clean cloth to keep it looking good. Since it's made of aluminum with a zinc finish, it's quite durable, but try to avoid harsh chemicals or abrasive materials that could damage the finish. If you notice any issues with the O - ring, you can use the replacement one that comes with the cap. And remember, it fits most Subaru models from 1989 - 2020, so it should work well with your car.