Truck maintenance and operation
2020 and 2021 X15 Efciency Hardware
QUICK REFERENCE GUIDE
For ease of identification, important characteristics of this engine are:
nSingle camshaft
nXPI fuel system
nSingle module DPF and SCR aftertreatment system
nECM 2450 (this control module incorporates DEF dosing control)
nVariable geometry turbocharger (VGT)
nExhaust gas recirculation system (EGR)
MAINTENANCE INTERVALS
DUTY CYCLE (MPG) SEVERE (3-4.9) SHORT HAUL (5-5.9) NORMAL (6-6.9) LIGHT (7+)
Oil drain intervals (ODI)*
25,000 miles /
12 months
50,000 miles /
12 months
60,000 miles /
12 months
75,000 miles /
12 months**
500 hours for vocational applications
with OilGuard
(TM)
program Extensions available Up to 100,000 miles
Fuel lter(s) 25,000 miles 50,000 miles 60,000 miles 75,000 miles
with FF5971NN Up to 100,000 miles
Diesel particulate lter
1
250,000–400,000 | 400,000–600,000 | 600,000–800,000
Coolant system ush Follow OEM coolant recommendations
DEF lter 300,000 miles / 6,750 hours
Engine brake assembly 500,000 miles / 10,000 hours / 60 months
Overhead adjustment 500,000 miles / 10,000 hours / 60 months
* The extreme severe duty cycle (<3 mpg) has an oil drain interval of 4,500 miles (7,000 kilometers), 500 hours or 12 months—whichever occurs first.
* Add 5,000 miles to severe, short haul and normal duty ODI when using Valvoline Premium Blue.
* Add 10,000 miles to light duty when using Valvoline Premium Blue.
** For oil drain intervals exceeding 60,000 miles, the use of LF14001NN lube oil filter is recommended.
MAINTENANCE INFORMATION
CAUTION
nNever crack a high pressure fuel line with the engine running. With
the engine stopped, relieve pressure only at the fuel pump inlet line
fitting on the side of the rail.
nWhen changing the engine-mounted fuel filter, never pre-fill by
pouring fuel in the center hole (clean side).
nRecommended procedure is to install filter dry and cycle the key
switch on 3–4 times and allow the priming pump to fill the filter.
nIf you have to pre-fill the filter, use the smaller outside holes (dirty
side) and let the fuel flow through the filter media to provide clean,
filtered fuel to the clean side.
nSynthetic or semi-synthetic oils may be beneficial for extreme arctic
or extreme heat conditions but DO NOT EXTEND oil drain intervals
with synthetic or semi-synthetic oils.
nTypical oil change volume: 36.3–43.8 liters (9.6–11.6 gal). For
full list of compatible oil weights, please refer to the Owners and
Operations manual: https://quickserve.cummins.com/qs3/pubsys2/
xml/en/procedures/377/377-018-003.html.
nCheck the oil pressure indicators, temperature indicators, warning
lights, and other gauges daily to make sure they are operational.
nCheck the oil pressure, coolant temperatures, DEF level, and other
engine parameters daily via the OEM instrument panel or gauge
cluster to make sure they are operational. Check the instrument panel
regularly for any alarm messages. Take appropriate action to rectify
the alarm condition or contact your nearest Cummins distributor.
ELECTRONIC FEATURES
For best fuel economy and performance, take advantage of the
following electronic engine features. Set the parameters to meet
your needs:
nEX ratings for enhanced powertrain features like on-ramp boost
and predictive braking
nPredictive cruise control
nRoad speed governor and cruise control
nIdle control
nLoad-based speed control
nGear down protection
Guidance is available for parameter settings: https://www.cummins
.com/support/digital-products-and-services-support/powerspec
-support.
424749_Cummins_5600512.indd 1 11/14/22 3:05 PM
Truck maintenance and operation: 2020 and 2021 X15 Efciency Hardware
QUICK REFERENCE GUIDE
DIESEL PARTICULATE FILTER
1
(DPF)
CLEANING
X15 engines incorporate an ash load monitor that the customers can
rely on to determine when the DPF cleaning is due. The driver will be
notified by the check engine lamp or amber warning lamp, which will
flash for 30 seconds after the key switch is set to ON.
If the aftertreatment DPF has been removed for cleaning and is
considered reusable (according to the Aftertreatment Diesel Oxidation
Catalyst and Aftertreatment Diesel Particulate Filter Reuse Guidelines,
bulletin 4021600), the aftertreatment DPF should be returned to
Cummins to be exchanged.
Cummins does not endorse localized air cleaning machines for ash
removal. All DPFs requiring ash cleaning should be returned to a
Cummins authorized repair location in exchange for a New/Recon DPF.
LUBRICATING OIL AND COOLING SYSTEMS
SPECIFICATIONS
Preferred oil filter
Fleetguard oil filter LF14001NN
Oil pressure
At idle (min at operating temperature) 68 kPa (10 psi)
At no-load governed speed 241 to 324 kPa (35 to 47 psi)
Oil pan drain fitting size
M27x2 STOR 35 lb-ft Torque
Typical oil change capacity (pan and filter)
Low 36.3 liters (9.6 gal)
Max 43.8 liters (11.6 gal)
Reference oil drain intervals specific to an oil and pan type:
https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/564
/564-018-017.html
COOLING SYSTEM
SPECIFICATIONS
Coolant capacity (engine only)
26.5 liters (28 qt)
Normal coolant temperature
Greater than 180°F (82.2°C)
Fan on at 210°F (99.0°C)
High temp alert 225°F (107. 2 ° C )
Pressure cap pressure
Minimum recommended 103 kPa (15 psi)
FUEL SYSTEM
SPECIFICATIONS
Preferred spin-on pressure fuel filter
Fleetguard part number FF5825NN
- OR -
Extended life fuel filter (up to 75,000 miles) FF5971NN
Spin-on suction fuel filter
Consult owner’s manual for OEM filter housing
Maximum pressure drop across fuel filter
600 kPa (87 psi)
Maximum fuel drain line pressure
High idle 102 mm-Hg (4 in-Hg)
Loaded condition 203 mm-Hg (8 in-Hg)
COOLING SYSTEM INFORMATION
Cummins recommends using either a 50/50 mixture of distilled water
and fully formulated antifreeze, or fully formulated coolant when filling
the cooling system. The fully formulated antifreeze or coolant must meet
Cummins Engineering Standard (CES)14603 specifications.
Most coolants which meet American Society of Testing and Materials
(ASTM) D6210 also meet CES14603.
However, some OAT coolants such as Shell™ Rotell ELC, Chevron™,
Texaco™, and Delo ELC and their private label counterparts meet
ASTM D6210, but do not meet the elastomer compatibility test of
CES14603. These coolants are acceptable for use, assuming the OEM
added silicate at initial fill. Refer to bulletin 3666132, Cummins
®
Coolant
Requirements and Maintenance, Section 3, Extended Service Interval,
for more details.
Good-quality water is important for cooling system performance.
Excessive levels of calcium and magnesium contribute to scaling
problems, and excessive levels of chlorides and sulfates cause cooling
system corrosion.
DIESEL EXHAUST FLUID
It is unlawful to tamper with or remove any component of the
aftertreatment system. It is also unlawful to use a Diesel Exhaust Fluid
(DEF) that does not meet the specifications provided or to operate
the vehicle/equipment with no DEF. Cummins is not responsible for
failures or damage resulting from what Cummins determines to be
abuse or neglect.
In compliance with the regulatory agencies (EPA and CARB), the
Cummins engine system incorporates on board diagnostics and
electronic controls to monitor and ensure that tail pipe emissions
requirements are met. A DEF lamp will notify the driver when the DEF
tank level is running low and/or the quality of the DEF in the tank is not
meeting specifications. Failure to promptly refill or replace DEF in the
tank will trigger an inducement sequence, limiting engine torque and,
eventually, vehicle speed to 5 mph.
For further details and discussion of DEF for Cummins engines, refer
to Diesel Exhaust Fluid Specifications for Cummins Selective Catalytic
Reduction Systems, bulletin 4021566.
For engines using SCR operating in the United States and Canada, it
is also strongly recommended that the DEF used be certified by the
American Petroleum Institute (API). This would be indicated by a symbol
on the container/dispensing system.
To ensure the correct DEF is used, Cummins recommends the use of
Fleetguard
®
Diesel Exhaust Fluid. Fleetguard
®
carries different quantity
options from small to bulk containers.
For complete maintenance recommendations and guidelines, refer
to the X15 CM2450 X124B Owner’s Manual, bulletin 5504581 or X15
CM2450 X124B Operation and Maintenance manual, bulletin 5504582.
cummins.com
Bulletin 5600512 Produced in U.S.A. Rev. 9/22
©2022 Cummins Inc.
424749_Cummins_5600512.indd 2 11/14/22 3:05 PM
