Using this Subaru OEM spark plug is easy. Just remove the old spark plug from your engine and replace it with this new one. Make sure to follow your car's maintenance schedule. When handling the spark plug, be gentle to avoid any damage. Remember, Subaru of America will only warranty parts installed on a car with a matching VIN. These clearance items can't be returned. To keep your engine running smoothly, check the spark plug regularly and replace it as recommended by your vehicle's manual.