Bar's Leaks 1196 Grey Radiator Stop Leak - 11 oz. Designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. Works with ALL types and colors of antifreeze coolant and/or water. Seals Leaks in Radiators, Gaskets, Heater Cores & Freeze Plugs Cooling systems that are dirty or partially clogged should be flushed before usage. One bottle treats up to 4 gallons. Use 12 bottle for four cylinder engines. For larger systems use 1 bottle for every 4 gallons of capacity. Works with all types and colors of anti-freeze coolant Stops and seals coolant leaks One bottle treats up to 4 gallons