MMD Equipment 185S-5C2 part 1 - Manual (Page 23)

4. Operation
4-5
4.2.3 Coolant
Use soft water of good quality such as tap water for coolant.
When water with dirt, sand, and/or dust contained, or hard water such as well water (ground water) is
used, this will cause deposits inside radiator or on cylinder head, and will cause engine overheat due to
poor flow of coolant.
When the unit is used in a cold region and possible freezing is expected, it is recommended to use LLC
(Antifreeze) for the coolant.
Adjust mixing ratio of LLC (Antifreeze) with water according to the temperature.
Use LLC (Antifreeze) within the range of its mixing ratio between 35 and 60%.
(Upon delivery from the factory, LLC density is 55%)
If LLC (Antifreeze) in the water exceeds more than 60%, it may decrease its antifreezing effect.
Follow the designated regulations to dispose of LLC.
4.2.4 Fuel
Be sure to use diesel fuel oil.
（
Using other oil will cause low power output or damage the engine.）
As for fuel, use diesel fuel oil (having higher than 45 cetane number).
Use of diesel fuel oil having lower than 45 cetane number will cause inferior function to engine and,
what is worse, it will cause serious accident to the engine.
Quality of coolant and antifreeze
Choose appropriate