Using this oil change kit is easy. First, make sure your engine is cool. Then, drain the old oil from your Subaru EJ engine. Remove the old oil filter carefully. Install the new Subaru OEM oil drain plug gasket on the drain plug and put it back in place. Next, install the new K&N oil filter. Finally, pour in the Motul 8100 5w30 X - Clean engine oil. Check the oil level to make sure it's right. When handling the oil, be careful not to spill it. Keep the kit in a dry place when not in use. For best results, change your oil according to your vehicle's maintenance schedule.