Antifreeze Antifreeze Longterm from the company Mannol in a 1lt package. It is a G11 antifreeze, ideal for old cars with high-capacity cooling systems. Since it is concentrated, you should dilute it with deionized water before placing it in your vehicle, the same water used in steam irons. You should consult the manufacturer's instructions for the dilution ratio. Its color is blue, indicating the composition used to prevent engine corrosion. You should consult the manufacturer's manual for the color of the antifreeze you will choose.