Using this oil change kit is easy. First, make sure your engine is cool. Then, remove the old oil drain plug and let the old oil drain out completely. Replace the old drain plug with the new Subaru OEM Oil Drain Plug Gasket included in the kit. Next, remove the old oil filter and install the new K&N Wrench - Off Oil Filer. Finally, pour in the Motul Synthetic - ester Racing Oil 300V POWER 5W40. Make sure to check the oil level after the change. As for maintenance, change the oil and filter regularly according to your vehicle's manual. Keep the kit in a cool and dry place when not in use. If you have any issues, consult a professional mechanic.