Bluecol is a universal top-up antifreeze/coolant which is suitable for use in all modern vehicles (both petrol and diesel) providing protection to -36.C at 50% dilution rate. It will mix with all colours of antifreeze already in the radiator/expansion tank. When Bluecol is added to antifreeze already in the cooling system, the synthetic process and additive package in Bluecol enhances and revitalizes the qualities of the original antifreeze, providing exceptional all year round protection and performance in all driving conditions.