Help reduce annoying oil leaks and prevent costly vehicle repairs with Nulon Engine Stop Leak NOTE: Can be used to control leaks in manual gearboxes and differentials. Benefits: -Reduces oil leaks - Rejuvenates hardened or shrunken seals - Reduces exhaust smoke at start-up or on take-off - Reduces oil consumption and oil burning - Can save the expense of seal replacement - Reduces leaks in all types of gearboxes and differentials