31
Fluids & Lubricants
COOLANT MIXTURES
Anti-freeze can be harmful. Obey the manufacturers instructions when
handling neat or diluted antifreeze.
NC recommends “Comma Xstream HD” anti-freeze. If another anti-freeze is used refer to
the manufacturers instructions and ensure a corrosion inhibitor is included. Must conform to
standard ASTM D6210 and be ethylene glycol based. DONOT use Organic Acid
Technology (OAT) antifreeze. Do not use solutions of more than 50% or less than 40%
antifreeze; as damage to the cooling system will occur.
50% antifreeze : 50% water solution: maintains protection down to –35°C .
Clean soft water should be used to dilute the antifreeze to 50:50 mix. The water should meet
the following specifications
Never use sea water, river or lake water, brackish water or industrial
waste water for conditioning the coolant.
Specifications of the water quality are made by the local water board.
The water must be conditioned if it deviates from the above specification. Contact NC for
further assistance.
The strength of the anti-freeze solution should be checked at least once a year, preferably at
the beginning of a cold period. It is an advantage to leave the anti-freeze in all year round as
it gives continued protection against corrosion. Always renew anti-freeze every two years. A
50% anti-freeze mixture is required even if frost protection is not required, as this raises the
coolants boiling point.
Serious damage can be caused to the engine if corrosion inhibitors are not used
pH value @ 20 deg C 6.5 - 8.5
Chloride-ion content Max. 100mg/l
Sulphate-ion content Max. 100mg/l
Total Hardness
corresponds to earth alkali content Ca
2+
+
Mg
2+
3 - 20 ºdGH
0.54 - 3.56 mmol/l
Carbonate Hardness
Corresponds to content of CaCO
3
Min. 3ºd
Max. 53.4 mg/l
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