Castrol Power 1 Racing 4T 10W-40 is a fully synthetic 4-stroke engine oil for modern, high-performance sports bikes that increases engine acceleration and power right up to maximum rpm. Castrol Power 1 Racing 4T 10W-40, using Race Derived Technology based on Castrol's long and successful racing association, flows fast and stays strong, reducing internal engine friction even under the most arduous riding conditions. Castrol Power 1 Racing 4T is specifically designed for bikers who love the exhilaration of riding on the limit. It has been tested and proven to deliver exceptional acceleration and power at the touch of the throttle. The added Castrol advantage of Trizone TechnologyTM ensures uncompromised performance protection.