Doosan 9/270 Operation And Maintenance Manual page 51

48 FUEL, LUBRICANTS, AND COOLANT
LUBRICANT.
Use of unsuitable engine oil will result in piston ring, piston and cylinder
seizure and accelerate surface wear causing increased oil
consumption, lowered output and, finally engine failure. To avoid this,
use the specified engine oil.
1) Engine Oil Selection
PRO-TEC
2) Oil Viscosity
Engine oil viscosity affects engine startability, performance, oil
consumption, wear and the potential for seizure, etc. Always ensure
that lubricants with the correct viscosity for the operating temperature
are used. Refer to fig 5.
A. (Single - grade)
B. Ambient Temperature
C. (Multi - grade)
COOLANT
All Doosan portable compressor engines are factory filled with a 50/50
Ethylene glycol base antifreeze/water mix. which provides protection to
-33° C (-27° F)
9/270, 9/300, 12/235, 17/235, 21/215, 9/270HA, 9/300HA, 10/300HA, 12/235HA, 17/235HA, 21/215HA
NOTE
Using a mixture of different brands or quality of oils will adversely af-
fect the original oil quality; therefore, never mix different brand or dif-
ferent type oils.
Do not use API, CA, CB grade and reconstituted engine oil
Engine damage due to improper maintenance, or using oil of the im-
proper quality and/or viscosity, is not covered by the warranty.
Fig. 5