Castrol Radicool Premix is a ready-to-use engine coolant that requires no customer dilution, ensuring the correct concentration is always used. Castrol Radicool Premix is the most effective coolant liquid, providing year-round protection against corrosion, and offers freezing protection down to -36°C. For optimum performance, this product should be replaced after 1 year. Castrol Radicool Premix engine coolant liquid can be used in both petrol and diesel engines with aluminium or cast-iron engines. Note that in the majority of cases, coolants are not compatible and should not be mixed with other coolants unless directed by the equipment manufacturer. If using Castrol Radicool Premix for the first time, ensure that the cooling system has been adequately flushed with clean water before use.