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Radiator Corrosion Inhibitor 500ml

RCI 100 is a Type "B", radiator corrosion inhibitor that protects against cavitation, scaling and oxidisation in vehicles that do not require a Type "" Anti-Freeze Anti-Boil coolant. It is an effective engine coolant that uses a Hybrid Organic Acid Technology (HOAT) inhibitor to provide maximum protection against corrosion whilst providing superior heat transfer to reduce engine operating temperature.



RCI 100 is suitable for use in a wide range of vehicles including passenger cars, light commercials vehicles, motorcycles, trucks, buses, stationary engines and other equipment.

RCI 100 when mixed with water will help provide improved heat transfer abilities over straight water by reducing cavitation and eliminating hot spots inside the engine. This can help lower the running temperature of the engine, preventing damage from overheating whilst the inhibitor pack will prevent rust, corrosion, scaling and oxidation if maintained at the correct dosage.

  • RCI 100 should be used at a ratio of 50ml per litre of water.
  • Penrite recommend mixing with Penrite De-Mineralised Water
  • 1 litre makes up to 20 litres of coolant.

HINT: For best results flush cooling system with Radiator Flush prior to filling with RCI 100

Service Intervals
Vehicle Type
Kilometres / Hours
Passenger Car 100,000 KMS
Light Commercial 100,000 KMS
Heavy Duty On Road 3 Years, 500,000 KMS
Heavy Duty Off Road 3 Years, 6,000 Hours
Stationary Power Generation 12,000 Hours
Marine 12,000 Hours
Please Note
  • We DO NOT recommend mixing with other coolants or inhibitors
  • This product is Not Compatible for testing with glycol coolant test strips as false readings can occur