Using this Red Line oil maintenance kit for your Subaru is easy. First, make sure your car's engine is cool. Then, locate the oil drain plug under the car and place a drain pan beneath it. Remove the drain plug and let the old oil drain completely. Replace the drain plug with the new gasket from the kit. Next, find the oil filter and remove it. Install the new Subaru OEM oil filter. Finally, pour in the five quarts of Red Line 5W30 motor oil. Check the oil level to make sure it's correct. As for maintenance, always keep an eye on your oil level between changes. And remember to change your oil at the recommended intervals for your Subaru model. Also, store the kit in a cool, dry place when not in use.