Castrol Power 1 10W-40 4T Full Synthetic Motorcycle Oil delivers premium engine protection engineered for modern motorcycles. This full synthetic formula provides superior lubrication across a wide temperature range, ensuring smooth performance in warm and cool conditions alike. Advanced anti-wear additives protect critical engine components from friction and wear, extending engine life and maintaining peak performance. The synthetic base stock resists breakdown better than conventional oils, offering extended drain intervals and consistent viscosity stability throughout the oil's service life. The 10W-40 weight provides optimal flow at cold startup while maintaining protective film strength at operating temperatures. Suitable for sport bikes, cruisers, and touring motorcycles that demand reliable, long-lasting engine care. Backed by Castrol's decades of powersports expertise, this motorcycle oil keeps your engine running strong and protected.