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HONDA Coolant. Honda Pro coolant offers maximum protection against corrosion as well as temperatures down to -36°C, giving perfect protection to all types of metals that are used in all Honda engines and cooling systems. Honda Coolant is pre-mixed and ready to use, do not add water. When replacing or adding coolant, please follow the Honda owner's manual. Drain and flush the cooling system before filling with new coolant. Sold in a 5L carton.