Branson 6640C Operator's Manual page 136

[Handling of Anti-Freeze]
Anti-freeze has an effect of lowering the freezing point of water. This tractor is filled with international genuine anti-freeze
when delivered from the factory. As the freezing point may differ depending on the mixture ratio, refer to the following table
in very cold weather to ensure safety.
Anti-Freeze Mixture Ratio
Outdoor Temp ('F)
Ratio (%)
Anti-Freeze (%)
[Precaution]
• When replacing the coolant, add anti-corrosive solution and run the engine for about five minutes to mix it with the water.
• For correct mixture ratio, refer to the manufacturer's instructions.
• When refilling the coolant, add only tap water.
• As anti-freeze expires in one year, replace the coolant every year.
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