Bar’s Leaks original stop leak has millions of tiny particles to permanently seal leaks in plastic, aluminum and metal radiators, heater cores, blocks, heads, gaskets and freeze plugs. The pre-dissolved liquid formula is available in two sizes. Part number R6 (5.5 oz) is for 4-cylinder engines; use part number C16 (10 oz) on 6, 8, and 10 cylinder engines or for hard to stop leaks on 4-cylinder engines. Bar’s Leaks Stop Leak and Conditioner is compatible with ALL brands of antifreeze including conventional green or blue (silicate-based) and extended life red/orange or yellow (OAT/HOAT) coolant. For most vehicles leaks stop in only a few minutes.

Features

• Seals Leaks
• Conditions Cooling System
• Inhibits Rust and Corrosion
• Prevents Corrosion
• Lubricates Water Pump Seal
• Helps Control Electrolysis