Castrol Radicool Premix is a mixture of monoethylene glycol, purified water and selected chemical inhibitors. It contains no nitrites, amines or phosphates. Because it contains no phosphate, the problems of deposit formation in some modern performance engines are reduced.
In some cases different coolants are not compatible and should not be mixed with other brands 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.
When top-up of the cooling system is necessary do not use water. Top-up only with Castrol Radicool Premix.