meet the classification will not provide adequate
MAINTENANCE
protection (varnish and ring sticking) for engines
its use is not immediately forthcoming,
special
operated in certain applications.
For example,
precautions should be taken to prevent rust.
turbocharged engines require the additional protection
provided by the CD classification. Engines operated in
Contact the nearest Cummins Distributor for information
stop and go service require the additional protection
concerning engine storage procedures.
provided by the SC classification.
LUBRICATION AND FUEL
3. A sulfated as h limit has been placed on all
lubricating oils for Cummins engines because past
LUBRICATING OIL
experience has shown that high ash oils may produce
harmful deposits on valves that can progress to guttering
Lubricating oil is used in Cummins engines to
and valve burning.
lubricate moving parts, provide internal cooling and keep
4. Completely ashless oils or high ash content oils,
the engine clean by suspending contaminants until
are not recommended for use in gas engines; a range of
removed by the oil filters.
ash content is specified.
Lubricating oil also acts as a combustion seal and
5. SD or SE may be substituted for SC.
protects internal parts from rust and corrosion.
The use of quality lubricating oil, combined with
BREAK IN OILS
appropriate lubricating oil, drain and filter change
intervals, is an important factor in extending engine life.
Special "Break-In" lubricating oils are not
Cummins Engine Company, Inc. does not recommend
recommended for new or rebuilt Cummins Engines. Use
any specific brand of lubricating oil. The responsibility
the same lubricating oil as will be used for the normal
for meeting the specifications, quality and performance
engine operation.
of lubricating oils must necessarily rest with the oil
supplier.
VISCOSITY RECOMMENDATIONS
TABLE 3-1: OIL RECOMMENDATIONS
1. Multigraded lubricating oils may be used in
applications
with
wide
variations
in
ambient
LIGHT SERVICE ONLY
NATURALLY
temperatures if they meet the appropriate performance
(STOP-AND-GO)
ASPIRATED
specifications and ash content limits shown in Table 3-1.
ALL DIESEL MODELS
DIESEL MODELS
Multigraded oils are generally produced by adding
viscosity index improver additives to a low viscosity base
AP1 Class CC/SC 2/5
AP1 Class CC 1
stock to retard thinning effects at operating
1.85% Maximum
1.85% Maximum
temperatures.
Poor quality multigraded oils use a
Sulfated Ash Content 3
Sulfated Ash Content 3
viscosity index improver additive which has a tendency
to lose its effectiveness after a short period of use in a
TURBOCHARGED
ALL NATURAL
high speed engine. These oils should be avoided.
DIESEL
GAS MODELS
2. Oils which meet the low temperature SAE
MODELS
ALL SERVICE
viscosity standard (O deg F (-18 deg C) carry a suffix
"W". Oils that meet the high temperature viscosity SAE
AP1 Class CC/CD 2
AP1 Class CC
standard 210 deg F (99 deg C) as well as the low
1.85% Maximum
03 to .85%
temperature carry both viscosity ratings example 20-
Sulfated Ash Content 3
Sulfated Ash Content 4
20W. See Table 3-2.
1. AP1 classification CC and CD quality oils as
TABLE 3-2: OPERATING TEMPERATURES VS VISCOSITY
used in turbocharged engines and AP1 classification
AMBIENT TEMPERATURES
VISCOSITY
CC/SC quality oils as used for stop-and-go service are
-10 deg. F (-23 deg. C) and
See Table 3-3.
satisfactory for use in naturally aspirated engines.
below
2. AP1 classification CC/SC and CC/CD indicate
-10 to 30 deg. F (-23 to
10W
-1 deg. C)
that the oil must be blended to the quality level required
20 to 60 deg. F (-7 to
20-20W
by both specifications. The range of oil quality permitted
16 deg. C)
by the CC classification is so broad that some oils that
40 deg. F (4 deg. C) and
30
above
40
