Doosan DX60R Shop Manual page 263

DANGER
For maximum engine life, DOOSAN recommends that when
shutting the engine down, you allow the engine to idle,
without load, for five minutes. This will allow the engine
components that operate at high temperatures, such as the
exhaust system, to cool slightly before the engine itself is
shut down.
CAUTION
Always be environmentally responsible.
Follow the guidelines of the EPA or other governmental
agencies for the proper disposal of hazardous materials
such as engine oil, diesel fuel and engine coolant. Consult
the local authorities or reclamation facility.
Never dispose of hazardous materials irresponsibly by
FG009156
dumping them into a sewer, on the ground, or into ground
Figure 102
water or waterways.
Failure to follow these procedures may seriously harm the
environment.
Change the fuel filter every 500hours of operation after initial
change at 50 hours. See "Replace Fuel Filter" on page -71
Engine SP001693
Page 83