BEFORE YOU OPERATE
YM Series Operation Manual 31
12/05
ENGINE OIL
Engine Oil Specifications
Only use the engine oil specified. Other
engine oils may affect warranty coverage,
cause internal engine components to seize
and / or shorten engine life.
Never mix different types of engine oil.
This may adversely affect the lubricating
properties of the engine oil.
Use an engine oil that meets or exceeds
the following guidelines and classifications:
• API Service Categories: CD,CF, CF-4,
CI and CI-4.
The oil must be changed when the Total
Base Number (TBN) has been reduced
to 2.0.
TBN (mgKOH/g) test method: JIS
K-2501–5.2–2(HCI), ASTM D4739(HCI)
• Recommended SAE Viscosity: 10W30,
15W40. Engine oil 10W30 and 15W40
can be used throughout the year.
• Never use API Service Category CG-4
or CH-4 oils.
• Be sure the engine oil, engine oil storage
containers and engine oil filling
equipment are free of sediment or water.
• Change the engine oil after the first 50
hours of operation and then at every 150
hours thereafter. See Changing the
Engine Oil on page 61.
• Select the oil viscosity based on the
ambient temperature where the engine
is being operated. See Engine Oil
Viscosity Figure 5.
• Yanmar does not recommend the use of
engine oil "additives."
Handling Engine Oil
• When handling and storing engine oil, be
careful not to allow dust and water to
contaminate the oil. Clean around the
filler port before filling.
• Do not mix lube oils of different types or
brands. Mixing may cause the chemical
characteristics of the oil to change and
lubricating performance to decrease,
reducing the engine’s life.
• Engine oil should be replaced at the
specified intervals, regardless of the
engine’s operation history. See Periodic
Maintenance Schedule on page 55.
Engine Oil Viscosity
Figure 5
• Select the appropriate engine oil
viscosity based on the ambient
temperature shown in the SAE Service
Grade Viscosity Chart (Figure 5).
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