Gives improved heat transfer, making a faster warm up and better cooling - up to 15° C reduction in engine operating temperature. Stay Cool also contains a powerful anti corrosion agent, very important with aluminium, steel, cast iron and bronze engine metal mixes, should be used in all engines. Does not contain damaging Ethylene Glycol but can be combined with antifreeze. Bottle treats 30 litres of coolant. Product image may differ from actual product. Bottle: 1 Liter