Royal Purple ROY01600 PURPLE ICE SUPER COOLANT, 12 oz, 1 Pack 2-in-1 corrosion inhibitor and wetting agent enhanced protection of aluminum Reduces surface tension of coolant allowing heat to transfer outside the radiator for more horsepower Reduces hot spots in the engine and cylinder heads to help prevent failure of critical engine components Maintains a cleaner system, prevents overheating and extends the life of the water pump Safe to use in water or anti-freeze/water blends