Castrol GO! 4T is a high quality engine oil designed for 4-stroke motorcycles. Developed with Castrol’s expertise in motorcycle lubricant design, it has Castrol’s TRIZONE TechnologyTM for a trouble-free ride time after time. Castrol’s TRIZONE TechnologyTM protects the engine, clutch and gears and allows the best functionality of these three critical areas of the motorcycle. Suitable for all makes of 4-stroke motorcycles, both carburetor or fuel injected. Always follow the vehicle manufacturer’s recommendations. Exceeds industry specifications API SG and JASO MA-2.