wc_tx003751gb_FM10.fm
186
Engine Maintenance: T4F Cummins QSB7-G9
770035
The primary Cummins Inc. recommendation is for the use of 15W-40 multigrade.
lubricating oil for normal operation at ambient temperatures above -15°C [5°F]. The use
of multigrade oil reduces deposit formation, improves engine cranking in low
temperature conditions, and increases engine durability by maintaining lubrication
during high temperature operating conditions. Since multigrade oils have been shown
to provide approximately 30 percent lower oil consumption than monograde oils, it is
important to use multigrade oils, to be certain the engine will meet applicable emissions
requirements.
Use of "synthetic engine oils" (those made with API group 3 or group 4 base stocks) is
permitted, subject to the same performance and viscosity limitations of petroleum
(mineral) based engine oils. The same oil change intervals that are applied to
petroleum (mineral) based engine oils must be applied to synthetic oils.
For further details and discussion of engine lubrication oils for Cummins® engines,
refer to the latest revision of Cummins® Engine Oil Recommendation, Bulletin
3810340.
While the preferred viscosity grade is 15W-40, lower viscosity multigrade oils can be
used in colder climates. See the accompanying chart. Any viscosity grade lower than
15W-40 must still meet CES 20081.
Synthetic engine oils, API Group III and Group IV basestocks, are recommended for
use in Cummins® engines operation in ambient temperature conditions consistently
below -25°C [-13°F]. Synthetic 0W-30 oils that meet the requirements of API Group III
Oil Viscosity
or Group IV basestocks, can be used in operations where the ambient temperature
never exceeds 0°C [32°F]. Multi viscosity oils rated 0W-30 do not offer the same level
of protection against fuel dilution as do higher multigrade oils. Higher cylinder wear can
be experienced when using 0W-30 oils in high-load situations.
s these oils have directionally thinner oil films than 15W-40 oils, top-quality
Fleetguard® filters must be used above 20°C [70°F]. Some oil suppliers might claim
better fuel economy for these oils. Cummins Inc. can neither approve nor disapprove
any product not manufactured by Cummins Inc. These claims are between the
customer and the oil supplier. Obtain a commitment from the oil supplier that the oil will
give satisfactory performance in Cummins® engines, or do not use the oil.
To Next Page
Loading...