It has been tested and proven to deliver exceptional acceleration and power at the touch of the throttle.. Riding hard puts the bike under a lot of stress leading to higher frictional losses.. Castrol POWER1 Racing 4T fully synthetic oil, with Race Derived Technology™ is proven to stay strong and deliver acceleration in race track conditions.. Castrol POWER1 Racing 4T is designed for high performance 4-stroke bikes to deliver optimum power in all riding conditions.. Castrol POWER1 Racing 4T is specifically designed for bikers who love the exhilaration of riding on the limit.. It is suitable for all makes of 4-stroke bikes, both carburetor or fuel injected where API SN (or below) and JASO MA or MA2 are recommended..