Oscar CoolCar Universal Antifreeze Concentrate G11 100% is a concentrate automotive radiator fluid composed of demineralized water, ethylene glycol and an advanced blend of balanced corrosion inhibitors. It’s designed to protect the cooling systems of water-cooled petrol engines. The majority of passenger cars’ and light diesel vehicles’ radiators can use Oscar CoolCar Coolant. Oscar CoolCar is a full mono ethylene glycol based coolant for a liquid cooled crankcase system. It contains anti-corrosion and antirust additives. It is harmless to rubber and does not foam or clog radiators. It must be mixed with water to a concentration of 33%, 40% & 50%. NEVER used more than 50%.