Castrol Radicool Coolant Concentrate Castrol Radicool Coolant Concentrate is a general purpose ethylene glycol based coolant with corrosion inhibitors to protect aluminium alloys, copper and cast iron engine components. Its mixture of monoethylene glycol and selected chemical agents contains no nitrites, amines or phosphates. It provides effective engine cooling without boiling. Suitable for the majority of cars and light commercial vehicles with petrol and diesel engines. Mix with equal parts of water for optimum performance. Browse online using our handy Rego Search tool to find the best Castrol oils for your application or come in store today and speak to one of our friendly staff. Changing your oil will also need you changing your oil filter to fully protect you engine and maximise the performance of your Castrol oil. When it comes to Oils and Fluids, the range doesn't just stop at Magnatec, GTX or Edge, Repco stock a range of quality Castrol Grease, Transmission Fluid, Gear Oil, Lawnmower and Motorbike Oil, Marine Oil and Additives all designed to protect and maximise the performance of any application.