Using this Motul engine oil maintenance kit is easy. First, make sure your car engine is cool. Then, find the oil drain plug under your Subaru and place a drain pan beneath it. Remove the drain plug and let the old oil completely drain out. Replace the drain plug with the new Subaru OEM Drain Plug Gasket provided in the kit. Next, locate the oil filter and remove it using an oil filter wrench. Install the new Subaru Genuine OEM Oil Filter. Finally, pour in the Motul 5L Synthetic Engine Oil 8100 5W30 X - Clean. After that, check the oil level to make sure it's at the right mark. When using this kit, always wear gloves to avoid getting oil on your hands. Keep the kit away from children and pets. For maintenance, you should change the oil again according to your Subaru's manufacturer - recommended intervals. This will help keep your engine running smoothly and extend its lifespan.