Yamaha rotor spindle oil is a synthetic blend created specifically for use on the exposed ends of rotary valve shafts (underneath the valve caps). An extended nozzle tip makes it easy to reach inside those tight valve clusters, while a special anti-corrosion agent helps protect the metal against long-term problems. Yamaha lubricants are made with the highest quality materials. Yamaha lubricants are offered in leak-proof plastic bottles for clean, easy application. .67oz bottle