Bars Leaks Radiator Stop Leak Concentrate (1196)
The Bar's Leaks brand is the most popular when it comes to cooling system products, thanks to their effectiveness and accessibility at most stores. They have multiple products for varying degrees and types of leaks, with their Radiator Stop Leak Concentrate being suited for stopping minor cooling system leaks. This product is good for radiator, heater core, and freeze plug leaks, while being compatible with all types of antifreeze. A single bottle can treat up to four gallons, making this a cost-effective option for temporarily sealing leaks.