Castrol POWER1 4T with Power Release Formula, designed to increase the exhilaration of 4-stroke riding. For 4-stroke motorcycles. Castrol POWER1 4T with Power Release Formula increases the exhilaration of the 4-stroke riding experience. Fast flowing, it reduces internal engine losses to friction and delivers improved acceleration at the touch of the throttle. Added Trizone Technology™ protects the performance of the engine, clutch and gearbox.