Using this oil change kit is easy. First, make sure your engine is cool. Then, remove the old oil drain plug gasket and drain the old oil. Replace it with the new Subaru OEM Oil Drain Plug Gasket included in the kit. Next, install the K&N Wrench - Off Oil Filer. Finally, pour in the Motul Synthetic - ester Racing Oil 300V POWER 5W40. Remember to check your engine's oil level after the change. For maintenance, always follow your Subaru's recommended oil change intervals. If you notice any oil leaks or strange noises, stop using the vehicle and have it checked by a professional.