Castor 927 is a unique blend of highly refined castor oil, a specially prepared synthetic and an;Castor 927 also contains an exclusive additive that keeps power valves cleaner and working properly;Castor 927 is biodegradable;Castor 927 keeps on lubricating; where other lubricants turn to carbon or vaporize, and provides;Castor 927 is ideally suited as a premix for both leaded and unleaded fuels