Not only is Trans-X® designed to fix and prevent leaks but this powerful formula will help revitalize harden seals, restore smooth shifting and prevent gear slippage. Add the fluid to the transmission fluid dipstick or directly to the transmission itself. It should work fairly quickly so if you continue to see leaks, take it in to a trusted mechanic as soon as possible. The powerful cleaning agents in Trans-X®, remove sludge, gums and varnish to prevent premature failure and extend transmission life. The naphthenic oils in Trans-X® work with the transmission to lubricate gears and help prevent gear slippage and harsh shifting. The solvents and oils in Trans-X® help revitalize the seals to keep them flexible and prevent leaks.