Maxima Castor 927 Engine Oil Castor 927 provides extra protection at the highest temperatures on cylinder walls, bearing journals and other critical areas. Unique blend of highly refined castor oil, a specially prepared synthetic in addition to an additive system that reduces carbon/ gum formation and is biodegradable. Features Excellent rust and corrosion protection Exclusive additive to keep power valves cleaner and working properly Surface active chemistry attaches to engine surfaces to keep them clean and protected Exotic esters and highly refined castor oil maintain oil film thickness For all carbureted 2-stroke engines not intended for oil injection systems