Castrol POWER1 4T is designed to optimize the performance of motorcycle engines.. Castrol POWER1 4T with Power Release TechnologyTM increases the performance of your bike by optimizing friction and allows you to accelerate faster.. Up to 30% of the power is lost due to friction without you noticing.. It is suitable for all brands of 4-stroke motorcycles, both carbureted and fuel injected, where API SN (or lower) and JASO MA or MA2 are recommended. Castrol POWER1 4T is an advanced, premium quality, semi-synthetic engine oil designed for the latest generation of 4-stroke motorcycle engines.. Power Release TechnologyTM optimizes friction in the clutch and reduces internal engine friction losses. Meets the requirements of catalytic converter-equipped engines. Tested and proven to deliver superior acceleration when turning the throttle.