1 x 1 Litre - Castrol Power 1 4T Semi Synthetic 10W30 Motorbike Engine Oil. Castrol POWER1 3-in-1 Formula 4T 10W-30 Motorcycle Engine Oil – 1L. Engine Type: 4-Stroke (4T). This 3-in-1 formula is suitable forengine, clutch, and gearbox, providing excellent wear protection while maintaining smooth clutch performance.