Castrol Power 1 4T 10W-40 is an advanced technology, high quality oil designed for the latest generation 4-stroke motorcycle engines. The Castrol Power 1 4T Series with Power Release Formula was designed specifically for riders who enjoy the thrill of riding. Power Release Formula has been specifically developed to enable your engine to continuously deliver maximum power up to the engine s rev limit, offering a significant advantage over other conventional motorcycle oils. The added benefit of Trizone Technology™ ensures top performance without compromise. Castrol Power 1 4T s Power Release Formula reduces internal engine losses, while maintaining optimum fluid clutch performance, ensuring efficient transmission of power to the rear wheel. Castrol Power 1 4T – Designed for performance