Using this oil change kit is easy. First, make sure your vehicle is parked on a flat surface and the engine is cool. Then, locate the oil drain plug under the engine and place an oil drain pan beneath it. Remove the drain plug and let the old oil drain completely. After that, replace the old oil drain plug gasket with the new one included in the kit and reinstall the drain plug. Next, remove the old oil filter and replace it with the K&N oil filter in the kit. Finally, pour the Motul 8100 5w30 X - Clean engine oil into the engine. When handling the oil, avoid spilling it on your hands or clothes. For maintenance, check the oil level regularly and change the oil and filter according to your vehicle's manufacturer - recommended schedule. This will keep your Subaru EJ engine running smoothly and performing at its best.