Doosan DX60R Shop Manual page 240

Observe the following environmental operating conditions
to maintain engine performance and avoid premature
engine wear:
The standard range of ambient temperatures for the normal
operation of 4TNV98-E engines is from +5°F (-15C°) to
+113°F (+45°C).
If the ambient temperature exceeds +113°F (+45°C) the
engine may overheat and cause the engine oil to break
down.
If the ambient temperature is below +5°F (-15°C) the engine
will be hard to start and the engine oil may not flow easily.
Contact your authorized DOOSAN dealer or distributor if
the engine will be operated outside of this standard
temperature range.
Never hold the key in the START position for longer than 15
seconds or the starter motor will overheat.
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
turbocharger (if equipped) and exhaust system, to cool
slightly before the engine itself is shut down.
Never use an engine starting aid such as ether. Engine
damage will result.
Engine
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