5 ENGINE OIL
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
109
Pub. No. 291Y1-40720 Revision: 5
5 ENGINE OIL
This chapter describes the engine oil which is used for this engine.
Engine Oil
Use the genuine engine oil.
• MITSUBISHI DIESEL ENGINE OIL
CH-4 15W-40
Fig. 5-1 MITSUBISHI DIESEL ENGINE OIL
When using the engine oil other than the genuine
ones, use the engine oil which meets "
Engine Oil
Quality Standards" (→ Page 198).
Do not mix and use Engine oil of different types
and/or manufacturers.
In addition, conduct the oil analysis earlier than the
normal change interval and check the change
interval.
• If you use the engine oil which does not
meet "
Engine Oil Quality Standards" (→
Page 198), for failures caused by the
engine oil, the warranty will become
invalid.
Engine Oil Grade
Use a CF grade engine oil or a CH-4 grade oil
which is certified by API service classification.
• When using a CF grade engine oil, use
the engine oil which had been certified
by API service classification CF grade
by 2009 and meets "
Engine Oil Quality
Standards" (→ Page 198).
• When using a CH-4 grade oil, the sulfur
content of fuel must be 0.2 mass% or
less.
Refer to the Engine Oil Properties
table in this Operation & Maintenance
Manual, and even if one item exceeds
the limit, the engine oil must not be
used.
* Otherwise, seizure of the sliding parts may
occur, which causes serious damage to the
devices.
Use the genuine engine oil specified
in this Operation & Maintenance
Manual.
* Otherwise, seizure of bearings, breakage of a
valve, sticking of a piston ring, seizure between
a ring and a cylinder, or premature wear of
bearings and sliding parts may occur and
shorten the service life of the engine.
Conduct analysis of the engine oil
periodically and make sure that the
engine oil does not show milky color.
* If the engine oil shows milky color, water may
be mixed into the engine oil system due to
coolant leak or a damaged cylinder liner O-ring.
Continued use of the engine without any
remedy may cause seizure of the crankshaft
and lead to serious damage to the devices.
Keep the quantity and properties
(viscosity) of the engine oil at the
specified level.
* If the supply or kinematic viscosity of engine oil
is too low, insufficient lubrication of the
bushings may occur and cause seizure of the
crankshaft.
* If kinematic viscosity of engine oil increases,
fuel consumption may increase.
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