Doosan DX700LC Operation And Maintenance Manual page 270

Types of Antifreeze
There are two main classifications of antifreeze available on the
market today.
1. Ethylene Glycol - Doosan Genuine Antifreeze Solution
(for all seasons)
2. Propylene Glycol - Doosan Genuine Antifreeze Solution
(for all seasons)
Ethylene glycol has been on the market for many years. Its
chemical properties do not provide the improved corrosion
resistance that propylene glycol does. Ethylene glycol is also
very hazardous to the environment, people and animals.
DOOSAN recommends that ethylene glycol be replaced with
propylene glycol.
The newer propylene glycol antifreeze comes in many different
colors. Some of the colors are pink, red, orange and yellow.
There are even some that come in a blue-green color. The
blue-green color makes it very difficult to tell the difference of
what type of antifreeze is in a cooling system. The colors are
only a dye added to the clear antifreeze. Do not rely on color.
Keep careful machine records of what brand and type of
antifreeze is used in the unit. If you are unsure of what type of
antifreeze is in the system, drain and flush the system.
Do not mix the ethylene glycol and propylene glycol
solutions. If these two chemicals are mixed, undesirable
chemicals may be formed, which damages the equipment.
Do not mix up the solutions from different manufacturers.
Otherwise, the performance may be deteriorated. It is
recommended to use the Doosan Genuine Product.
In the regions under extreme weather, the user should
determine the performance of the coolant suitable for the
weather condition and decide the replacement cycle.
Inspection, Maintenance and Adjustment
4-82
CAUTION
OP001123