Stop leak Scientifically formulated to keep transmissions running smoothly while stopping leaks A blend of the latest in transmission fluid technology and advanced stop leak additives 2 in 1 formula was formulated for use in automatic transmissions manufactured by General Motors, Ford, Chrysler, and most foreign car manufactures Plus formula has powerful additives to help stop leaks and seepage due to hard, dry, or cracked seals Use for topping off your car or trucks transmission system or when changing your transmission fluid. 32 oz