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The cooling system on a car is often the most neglected part, but is actually one of the most important. A significant number of engine failures are related to coolant system malfunctions. Taking care of the cooling system reduces downtime and the inevitable cost of repairs. Use of the correct dilution for the climate your car operates in is key to ensure total protection.

Radicool Premix

castrol Radicool Premix

Replaces Castrol Radicool

Premixed engine coolant (33%), for both petrol and diesel engines that cools and protects.


For a wide range of petrol and diesel engines

Features & Benefits


  • A complete fill, ethylene glycol premix coolant i.e., “ready-to-use – simply pour“. It is premixed to 33 vol% concentration.
  • Improved engine corrosion protection helping to resist the formation of rust while protecting alloy heads and engines.
  • Improved protection against cavitation in water pumps and hot spots (e.g., behind exhaust ports) in aluminium cylinder heads.
  • Excellent hot weather protection - helps prevent the risk of the engine coolant boiling, leading to coolant loss and possible engine damage and subsequent failure.
  • Excellent cold weather protection - reduces the real risk of coolant freezing solid in the engine coolant system and severely damaging engines and/or radiators.
  • Easy to use.

industry Specifications


  • ASTM D3306
  • BS6580:2010


Advanced Performance Series

Radicool Concentrate

Radicool Concentrate

A general purpose ethylene glycol based coolant with corrosion inhibitors to protect aluminium alloys, copper and cast iron engine components.


Suitable for the majority of cars and light commercial vehicles with petrol and diesel engines. Has an in-vehicle service life of 4 years / 250,000 kilometres.


Mix with equal parts of water for optimum performance.


Features & Benefits


  • Contains no nitrites, amines or phosphates
  • Effective engine cooling without boiling
  • Protection against corrosion in the alloys used in the cooling systems of modern vehicles
  • Protection against freezing depending on the concentration
  • Protection against electrolysis
  • Protection against cavitation corrosion
  • Efficient lubrication of water pumps
  • Compatible with conventional hose and seal materials used in engine cooling systems 




  • AS 2108-2004 Type A
  • BS 6580 2010
  • ATM D3306: D4985
  • SAE J1941 
  • GM 1825M: GM 1899M 
  • Ford ESE- M97B44-A 
  • Ford WSS-M 97B51-A1 ( passenger car )
  • SAE J20  
  • HN 2043 / GM 6043M ( performance )  

industry Specifications


  • ASTM D3306 I
  • BS 6580:2010
Radicool NF

Radicool NF

An antifreeze concentrate coolant formulated using hybrid technology for the modern performance engines of cars and trucks.


Castrol Radicool NF has been developed to meet the growing demand from engine and vehicle manufacturers for a higher performance coolant that minimises environmental impact. It provides excellent protection against corrosion, and because it contains no phosphate, the problems of deposits in some modern performance engines are eliminated.


This coolant should be used at concentrations of between 33 % and 50% dilution with purified water to give optimum corrosion protection and freezing protection between -18°C and -36 °C.

Features & Benefits


  • Protects for up to 5 years, 9000 hrs / 600,000 kms.
  • Excellent low temperature protection
  • Provides excellent protection against corrosion
  • Efficient lubrication of water pumps
  • Compatible with conventional seal and hose materials used in engine cooling systems
  • Contains bittering agent.
  • Has many OEM approvals



  • D3306, D4985
  • BS6580:2010
  • JASO JIS K2234
  • Deutz TR 0119-99-1115
  • MAN 324 Typ NF
  • MB-Approval 325.0
  • MTU MTL 5048
  • VW TL-774C (G11)
  • BMW N 600 69.0
  • Opel/GM B 040 0240
  • Saab 6901599
Radicool SI-OAT

Radicool Si-OAt

A nitrite, amine and phosphate free antifreeze coolant with added silicate for the latest vehicles requiring silicate containing OAT technology. Aqueous solutions of Castrol Radicool Si-OAT act as both antifreeze and coolant and offer excellent corrosion protection to all metal parts found in the cooling systems of internal combustion engines.


Castrol Radicool Si-OAT should be used at concentrations of between 33% and 50% dilution with purified water to give optimum corrosion protection and freezing protection between -18°C and -36°C.




  • Excellent low temperature protection.
  • Provides superior protection against all forms of corrosion.
  • Minimises deposit formation, because of its phosphate free formulation.
  • Approved for use in Euro 6 generation truck and bus engines.