Castrol Cyltech 40SX is a Marine diesel engine cylinder lubricant engineered with a specialized detergency system for optimal performance in modern engines operating on fuels with 0.0 - 1.5% Sulphur content or LNG. It offers excellent control of piston ring and cylinder liner wear, superior engine cleanliness by reducing deposits, and a higher safety margin against bore polishing or scuffing during prolonged low-sulphur fuel operation compared to higher BN cylinder oils.