Kohler SFGLD480 Operation & Maintenance Manual page 178

The figure below can be used to check the recommended glycol ratio according to the ambient temperature.
As a rule, where the objective is to increase the boiling temperature of water without it evaporating, Kohler
recommends adding around 10% of glycol to the water, not only where there is risk of freezing. The
antifreeze will not only prevent the possibility of the water boiling but it will also protect against possible
corrosion thanks to its anticorrosive additives which antifreeze normally contains.
In the case of ambient temperatures being very low and there is a risk of freezing, the maximum permitted amount
of glycol, and for use only in engines, is 50%. The use of incorrect quantities of antifreeze in the cooling circuit can
lead to a reduction in heat transfer from the cooling fluid and can affect the performance of the engine.
Here we can find ourselves faced with:
• Increased internal temperature of head and shroud
• Increased intake temperature.
• Increased exhaust temperature
Therefore, and in order to maintain the best possible performance, if the content of glycol is more than 30%
then a change should be made at the end of the cold season to use coolant with % glycol in accordance with
the indications of the following chart; in any case a minimum of about 10% antifreeze is recommended.
PRODUCT INFORMATION
IO-C-M-20-001e
COOLING WATER QUALITY AND TREATMENT
Glycol Concentration, % weight
4.1.9
INDEX DATE
D
February 2016
O&M_2.002211.810_A_10_2016
Dep. 2
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