Other Products

Castrol Radicool
Castrol Lubricant Oils Company Logo

Summer coolant and antifreeze.


Castrol Radicool is a concentrated engine coolant for use in both petrol and diesel engines with aluminium or cast iron engines.
This coolant can be mixed using 33% concentration with purified water to give frost protection to -18 deg C, however it is recommended to use a 50% dilution to provide optimum corrosion protection and freeze protection down to -36 deg C.
At these concentrations this coolant will provides year round protection. To maintain optimum performance this product should be replaced after 1 year


Castrol Radicool is a mixture of monoethylene glycol and selected chemical agents. It contains no nitrites, amines or phosphates. Because it contains no phosphate, the problems of deposits in some modern performance engines are reduced.
Castrol Radicool provides –

  • protection against hard water
  • effective engine cooling without boiling;
  • protection against corrosion of the alloys used in the cooling system of modern vehicles;
  • compatibility with conventional seal and hose materials used in engine cooling systems;
  • protection against cavitation corrosion;
  • efficient lubrication of water pumps
  • contains bittering agent

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 for the first time, ensure that the cooling system has been adequately flushed with clean water
before use

Name Method Units Castrol Radicool
Density @ 20C


ASTM D1122 g/ml 1.12


Visual Bright clear fluid
pH, Aqueous Solution (50%)


ASTM D1287 pH 7.5
Foam, Tendency of Engine Coolants


ASTM D1881 ml 50 max
Foam, break time


ASTM D1881 seconds 5 max


ASTM D1123 % wt 5 max
Boiling Point of Engine Coolants ASTM D1120 °C 160 min

BS – BS 6580:2010


Castrol Radicool has a shelf life of 2 years when stored in air tight containers at a maximum temperature of 30°C. In warm climates containers should not be stored outside in direct sunlight. It can be stored in mild steel lacquer lined or HDPE containers . Galvanised containers and handling equipment should be avoided.

Contact Us 

Product Data Sheet 

Safety Data Sheet


Get a quote now

How can we help? Do you need more information? Please message us with your contact details, product name, product application and pack size / volumes required.

More info

Shop by Brand