Castrol 06114 POWER 1 4T 10W-50 Synthetic Motorcycle Oil, 1 Quart Bottle, 6 Pack Castrol POWER1 4T with Power Release Formula is designed specifically for bikers who love the exhilaration of riding Advanced, full synthetic, premium quality engine oil designed for 4-stroke motorcycles It has been tested and proven to deliver superior acceleration at the touch of the throttle as it flows fast and minimizes internal engine friction Exceeds Specifications API SL, JASO MA-2 Suitable for all makes of 4-stroke bikes, both carburetor and fuel injected. Always follow the vehicle manufacturers recommendations.