Yamaha Original OEM Oil and Air Filter Change Kits. Differential and Gear Oil change Kits. Every kit, every part contains all Original OEM Yamaha parts. Every gasket, O-ring, crush washer and filter is made by Yamaha- specifically for Yamaha. If you receive this kit and there are 3rd party gaskets, or the parts are not in Original Yamaha Part packaging - please return the kit immediately for full refund – You do not want to risk your Yamaha with inferior parts. We understand that quality does cost more even if it's just a gasket. Better Quality means longer lasting and better performance. So, the choice is yours, I know I always choose Yamaha OEM parts for my Yamaha, down to every nut, bolt and washer.