Castrol POWER1 4T 10W-40 is an advanced, premium quality part synthetic engine oil developed for the latest generation 4-stroke motorcycle engines. Castrol POWER1 4T with Power Release Formula is designed specifically for bikers who love the exhilaration of riding. Its Power Release Formula is specially designed to enable your bike to deliver maximum and sustained power right up to very high operating rpm thus offering a significant advantage over other motorcycle engine oils. The added Castrol advantage of Trizone Technology ensures uncompromised performance protection. Power Release Formula of Castrol POWER1 4T reduces internal losses in the engine, whilst retaining optimum wet clutch performance to ensure efficient transfer of power to the rear wheel. Castrol POWER1 4T - engineered for performance. Advanced 4-stroke motorcycle engine oil formulation Tested and proven to deliver improved acceleration at the touch of the throttle Flows fast and reduces internal engine losses to friction Trizone Technology for protection of engine, clutch and gears Test data shows that Castrol POWER1 4T 10W-40 enables a 6.9% improvement in acceleration over a 20W-50 market general product Castrol POWER1 4T 10W-40 is designed to optimise performance and protection for modern motorcycles where API SJ and JASO MA2 are recommended.