Wynn's SP74941 Stop Oil Leak is a high-performance oil soluble supplement engineered to effectively stop and prevent oil leaks in various machinery without requiring costly dismantling. This advanced formula works by restoring the elasticity of hardened or shrunken rubber and neoprene oil seal rings and O-rings. It is fully compatible with all mineral and synthetic motor oils, gear oils, and hydraulic oils, making it versatile for a wide range of applications. Note: Not suitable for systems using 'green' hydraulic oil. This additive maintains oil quality and viscosity, ensuring optimal engine and system performance. Ideal for petrol, diesel, and LPG engines, manual gearboxes, power steering, and hydraulic systems.