coolant RAM CHASSIS CAB 2023 Owner's Guide

SERVICING AND MAINTENANCE345
Replace spark plugs.
1X
Flush and replace the engine coolant at
10 years or 150,000 miles (240,000 km)
whichever comes first. X
X
Change the automatic transmission fluid
(AS66RCTransmission Only). X
X X
Inspect the transfer case fluid, change for
any of the following: police, taxi, fleet, or
frequent trailer towing. X
X
Change the transfer case fluid. X

Inspect and replace PCV valve if necessary.
X
1. The spark plug change interval is mileage based only, yearly intervals do not apply.
Mileage Or Time Passed
(Whichever Comes First)
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
110,000
120,000
130,000
140,000
150,000
Or Years: 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
32,000
48,000
64,000
80,000
96,000
112,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
WARNING!
You can be badly injured working on or around a motor vehicle. Do only service work for which you have the knowledge and the right equipment. If you have
any doubt about your ability to perform a service job, take your vehicle to a competent mechanic.
Failure to properly inspect and maintain your vehicle could result in a component malfunction and affect vehicle handling and performance. This could
cause an accident.
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SERVICING AND MAINTENANCE349
Replace Crankcase Ventilation
Filter (CCV). X
X
Flush and replace power steering
fluid. X
Flush and replace engine coolant.
*** X
1. Under no circumstances should oil change intervals exceed 15,000 miles (24,000 km) or 12 months or 500 Hours, whichever comes first.
2. Under no circumstances should the engine air cleaner filter exceed 30,000 miles (48,000 km) or 24 months, whichever comes first.
Mileage Or Time Passed
(Whichever Comes First):
7,500
15,000
22,500
30,000
37,500
45,000
52,500
60,000
67,500
75,000
82,500
90,000
97,500
105,000
112,500
120,000
127,500
135,000
142,500
150,000
Or Months: 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
Or Kilometers:
12,000
24,000
36,000
48,000
60,000
72,000
84,000
96,000
108,000
120,000
132,000
144,000
156,000
168,000
180,000
192,000
204,000
216,000
228,000
240,000
WARNING!
You can be badly injured working on or around a motor vehicle. Do only service work for which you have the knowledge and the right equipment. If you have
any doubt about your ability to perform a service job, take your vehicle to a competent mechanic.
Failure to properly inspect and maintain your vehicle could result in a component malfunction and affect vehicle handling and performance. This could
cause an accident.
CAUTION!
***The manufacturer highly recommends that all cooling system service, maintenance, and repairs be performed by your local authorized dealer.
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350SERVICING AND MAINTENANCE
ENGINE COMPARTMENT
6.4L GASOLINE ENGINE
1 — Engine Coolant Pressure Cap 6 — Engine Air Cleaner Filter
2 — Engine Oil Fill 7 — Power Steering Reservoir Cap
3 — Engine Oil Dipstick 8 — Power Distribution Center (Fuses)
4 — Brake Fluid Reservoir Cap 9 — Washer Fluid Reservoir Cap
5 — Battery

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SERVICING AND MAINTENANCE351
6.7L DIESEL ENGINE
1 — Battery 7 — Brake Fluid Reservoir Cap
2 — Engine Coolant Pressure Cap 8 — Battery
3 — Engine Coolant Pressure Reservoir 9 — Power Distribution Center (Fuses)
4 — Engine Oil Fill 10 — Engine Air Cleaner Filter
5 — Engine Oil Dipstick 11 — Power Steering Reservoir Cap
6 — Automatic Transmission Dipstick 12 — Washer Fluid Reservoir Cap
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368SERVICING AND MAINTENANCE
(Continued)
To minimize the possibility of catalytic converter
damage:
Do not interrupt the ignition when the transmis
-
sion is in gear and the vehicle is in motion.
Do not try to start the vehicle by pushing or
towing the vehicle.
Do not idle the engine with any ignition compo -
nents disconnected or removed, such as when
diagnostic testing, or for prolonged periods
during very rough idle or malfunctioning oper -
ating conditions.
COOLING SYSTEM
Engine Coolant Checks
Check the engine coolant (antifreeze) protection
every 12 months (before the onset of freezing
weather, where applicable). If the engine coolant is
dirty or rusty in appearance, the system should be
drained, flushed and refilled with fresh coolant.
Check the front of the A/C condenser or radiator
for any accumulation of bugs, leaves, etc. If dirty,
clean by gently spraying water from a garden hose
vertically down the face of the A/C condenser or
the back of the radiator core.
Check the engine cooling system hoses for brittle
rubber, cracking, tears, cuts and tightness of the
connection at the coolant recovery bottle and
radiator. Inspect the entire system for leaks.
DO NOT REMOVE THE COOLANT PRESSURE CAP
WHEN THE COOLING SYSTEM IS HOT.
Cooling System — Drain, Flush And Refill
NOTE:Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could lead to severe internal engine damage. If any
coolant is needed to be added to the system
please contact an authorized dealer.
If the engine coolant (antifreeze) is dirty or
contains visible sediment, have an authorized
dealer clean and flush with Organic Additive
Technology (OAT) coolant (conforming to
MS.90032).
For the proper maintenance intervals
Úpage 344.
Selection Of Coolant
For further information Ú page 419.
NOTE:
Mixing of engine coolant (antifreeze) other than
specified Organic Additive Technology (OAT)
engine coolant, may result in engine damage
and may decrease corrosion protection. OAT
engine coolant is different and should not be
mixed with Hybrid Organic Additive Technology
(HOAT) engine coolant or any “globally compat -
ible” coolant. If a non-OAT engine coolant is
introduced into the cooling system in an emer -
gency, the cooling system will need to be
drained, flushed, and refilled with fresh OAT
coolant (conforming to MS.90032), by an autho -
rized dealer as soon as possible.
Do not use water alone or alcohol-based engine
coolant products. Do not use additional rust
inhibitors or anti-rust products, as they may not
WARNING!
You or others can be badly burned by hot
engine coolant (antifreeze) or steam from your
radiator. If you see or hear steam coming from
under the hood, do not open the hood until the
radiator has had time to cool. Never open a
cooling system pressure cap when the radi -
ator or coolant bottle is hot.
Keep hands, tools, clothing, and jewelry away
from the radiator cooling fan when the hood is
raised. The fan starts automatically and may
start at any time, whether the engine is
running or not.
When working near the radiator cooling fan,
disconnect the fan motor lead or turn the igni -
tion to the OFF position. The fan is tempera -
ture controlled and can start at any time the
ignition is in the ON position.
WARNING!

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SERVICING AND MAINTENANCE369
be compatible with the radiator engine coolant
and may plug the radiator.
This vehicle has not been designed for use with
propylene glycol-based engine coolant. Use of
propylene glycol-based engine coolant is not
recommended.
Some vehicles require special tools to add
coolant properly. Failure to fill these systems
properly could lead to severe internal engine
damage. If any coolant is needed to be added to
the system please contact an authorized dealer.
Adding Coolant
Your vehicle has been built with an improved
engine coolant (OAT coolant conforming to
MS.90032) that allows extended maintenance
intervals. This engine coolant (antifreeze) can be
used up to ten years or 150,000 miles
(240,000 km) before replacement. To prevent
reducing this extended maintenance period, it is
important to use the same engine coolant (OAT
coolant conforming to MS.90032) throughout the
life of your vehicle.
Please review these recommendations for using
Organic Additive Technology (OAT) engine coolant
that meets the requirements of the manufacturer
Material Standard MS.90032. When adding
engine coolant:
We recommend using Mopar® Antifreeze/
Coolant 10 Year/150,000 Mile (240,000 km)
Formula OAT that meets the requirements of the
manufacturer Material Standard MS.90032.
Mix a minimum solution of 50% OAT engine
coolant that meets the requirements of the
manufacturer Material Standard MS.90032
and distilled water. Use higher concentrations
(not to exceed 70%) if temperatures below
−34°F (−37°C) are anticipated. Please contact
an authorized dealer for assistance.
Use only high purity water such as distilled or
deionized water when mixing the water/engine
coolant solution. The use of lower quality water
will reduce the amount of corrosion protection
in the engine cooling system.
NOTE:
It is the owner's responsibility to maintain the
proper level of protection against freezing
according to the temperatures occurring in the
area where the vehicle is operated.
Some vehicles require special tools to add
coolant properly. Failure to fill these systems
properly could lead to severe internal engine
damage. If any coolant is needed to be added to
the system, please contact a local authorized
dealer.
Mixing engine coolant types is not recom -
mended and can result in cooling system
damage. If HOAT and OAT coolant are mixed in
an emergency, have an authorized dealer drain,
flush, and refill with OAT coolant (conforming to
MS.90032) as soon as possible.
Cooling System Pressure Cap
The cap must be fully tightened to prevent loss of
engine coolant (antifreeze), and to ensure that
engine coolant will return to the radiator from the
coolant expansion bottle/recovery tank
(if equipped).
The cap should be inspected and cleaned if there
is any accumulation of foreign material on the
sealing surfaces.
WARNING!
Do not open a hot engine cooling system.
Never add engine coolant (antifreeze) when
the engine is overheated. Do not loosen or
remove the cap to cool an overheated engine.
Heat causes pressure to build up in the
cooling system. To prevent scalding or injury,
do not remove the pressure cap while the
system is hot or under pressure.
Do not use a pressure cap other than the one
specified for your vehicle. Personal injury or
engine damage may result.
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370SERVICING AND MAINTENANCE
Disposal Of Used Coolant
Used ethylene glycol-based coolant (antifreeze) is
a regulated substance requiring proper disposal.
Check with your local authorities to determine the
disposal rules for your community. To prevent
ingestion by animals or children, do not store
ethylene glycol-based coolant in open containers
or allow it to remain in puddles on the ground,
clean up any ground spills immediately. If ingested
by a child or pet, seek emergency assistance
immediately.
Checking Coolant Level — 6.4L Engine
The level of the coolant in the pressurized coolant
bottle should be between the “MIN” and “MAX”
range on the bottle when the engine is cold.
The radiator normally remains completely full, so
there is no need to remove the cap unless
checking for coolant freeze point or replacing
engine coolant (antifreeze). Advise your service
attendant of this. As long as the engine operating
temperature is satisfactory, the coolant bottle
need only be checked once a month. When
additional engine coolant is needed to maintain
the proper level, it should be added to the coolant
bottle. Do not overfill.
Cooling System Notes
NOTE:When the vehicle is stopped after a few miles/kilo -
meters of operation, you may observe vapor
coming from the front of the engine compartment.
This is normally a result of moisture from rain,
snow, or high humidity accumulating on the
radiator and being vaporized when the thermostat
opens, allowing hot engine coolant (antifreeze) to
enter the radiator.
If an examination of your engine compartment
shows no evidence of radiator or hose leaks, the
vehicle may be safely driven. The vapor will soon
dissipate.
Do not overfill the coolant expansion bottle.
Check the coolant freeze point in the radiator
and in the coolant expansion bottle. If engine
coolant (antifreeze) needs to be added, the
contents of the coolant expansion bottle must
also be protected against freezing.
If frequent engine coolant additions are
required, the cooling system should be pressure
tested for leaks.
Maintain engine coolant concentration at a
minimum of 50% OAT coolant (conforming to
MS.90032) and distilled water for proper corro -
sion protection of your engine which contains
aluminum components.
Make sure that the coolant expansion bottle
overflow hoses are not kinked or obstructed.
Keep the front of the radiator clean. If your
vehicle is equipped with air conditioning, keep
the front of the condenser clean.
Do not change the thermostat for Summer or
Winter operation. If replacement is ever neces -
sary, install ONLY the correct type thermostat.
Other designs may result in unsatisfactory
engine cooling performance, poor gas mileage,
and increased emissions.
CHARGE AIR COOLER — INTER-COOLER
The charge air cooler is positioned below the
radiator and the air conditioner condenser. Air
enters the engine through the air cleaner and
passes through the turbocharger, where it is
pressurized. This pressurized air rapidly reaches
high temperature. The air is then directed through
a hose to the charge air cooler and through
another hose to the intake manifold of the engine.
The air entering the engine has been cooled by
about 50° to 100°F (10° to 38°C). This cooling
process enables more efficient burning of fuel
resulting in fewer emissions.

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TECHNICAL SPECIFICATIONS419
ENGINE FLUIDS AND LUBRICANTS
6.4L GASOLINE ENGINE
6.7L DIESEL ENGINE
Component Fluid, Lubricant, or Genuine Part
Engine CoolantWe recommend using Mopar® Antifreeze/Coolant 10–Year/150,000 Mile
(240,000 km) Formula OAT (Organic Additive Technology).
Engine Oil We recommend using Mopar® API Certified SAE 0W-40 Full Synthetic Engine Oil which meets the
requirements of the manufacturer Material Standard MS-A0921. Equivalent full synthetic SAE 0W-40
engine oil can be used but must have the API Donut trademark Ú
page 354.
Fuel Selection 87 Octane (R+M)/2 Method, 0-15% Ethanol (Do not use E-85).
Component Fluid, Lubricant, or Genuine Part
Engine CoolantWe recommend using Mopar® Antifreeze/Coolant 10 Year/150,000 Mile
(240,000 km) Formula OAT (Organic Additive Technology).
Engine Oil In ambient temperatures above 0°F (-18°C), we recommend using 10W-30 engine oil such as Mopar®,
Shell Rotella and Shell Rimula that meets the manufacturer Material Standard MS-10902 and the API CK-4
engine oil category is required. Products meeting Cummins® CES 20081 may also be used. The
identification of these engine oils is typically located on the back of the oil container.
In ambient temperatures below 0°F (-18°C), we recommend using 5W-40
synthetic engine oil such as
Mopar®, Shell Rotella and Shell Rimula that meets the manufacturer Material Standard MS-10902 and the
API CK-4 engine oil category is required.
Fuel Filters We recommend using Mopar® Fuel Filter. Must meet 3 micron rating (engine mounted filter). Must meet
5 micron rating (chassis mounted filter).
Using a fuel filter that does not meet the manufacturer’s filtration
and water separating requirements can severely impact fuel system life and reliability.
Crankcase Ventilation Filter We recommend using Mopar® CCV Filter.
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420TECHNICAL SPECIFICATIONS
Fuel Selection
Use good quality diesel fuel from a reputable supplier in your vehicle. Federal law requires that you must fuel
this vehicle with Ultra Low Sulfur Highway Diesel fuel (15 ppm Sulfur maximum) and prohibits the use of Low
Sulfur Highway Diesel fuel (500 ppm Sulfur maximum) to avoid damage to the emissions control system.

For most year-round service, Number 2 diesel fuel meeting ASTM specification D-975 Grade S15 will
provide good performance.
If climatized or diesel Number 1 ULSD fuel is not available, and you are operating below (20°F/-6°C), in
sustained arctic conditions, Mopar® Premium Diesel Fuel Treatment (or equivalent) is recommended to
avoid gelling.
This vehicle is fully compatible with biodiesel blends up to 5% biodiesel meeting ASTM specification D-975.

Pickup models, and Chassis Cab models configured with optional B20 capability, are additionally
compatible with 20% biodiesel meeting ASTM specification D-7467.
Diesel Exhaust Fluid Mopar® Diesel Exhaust Fluid (API Certified) (DEF) or equivalent that has been API Certified to the ISO
22241 standard. Use of fluids not API Certified to ISO 22241 may result in system damage. You can receive
assistance in locating DEF in the United States by calling 866-RAM-INFO (866-726-4636). In Canada call
1–800–465–2001 (English) or 1–800–387–9983 (French).
Component
Fluid, Lubricant, or Genuine Part
CAUTION!
Mixing of engine coolant (antifreeze) other than specified Organic Additive Technology (OAT) engine coolant (antifreeze), may result in engine damage and
may decrease corrosion protection. Organic Additive Technology (OAT) engine coolant is different and should not be mixed with Hybrid Organic Additive Tech -
nology (HOAT) engine coolant (antifreeze) or any “globally compatible” coolant (antifreeze). If a non-OAT engine coolant (antifreeze) is introduced into the
cooling system in an emergency, the cooling system will need to be drained, flushed, and refilled with fresh OAT coolant (conforming to MS.90032), by an
authorized dealer as soon as possible.
Do not use water alone or alcohol-based engine coolant (antifreeze) products. Do not use additional rust inhibitors or antirust products, as they may not be
compatible with the radiator engine coolant and may plug the radiator.
This vehicle has not been designed for use with propylene glycol-based engine coolant (antifreeze). Use of propylene glycol-based engine coolant (anti -
freeze) is not recommended.

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428
INDEX
A
Adaptive Cruise Control (ACC)
(Cruise Control)
.................................... 148, 150Adding Engine Coolant (Antifreeze)............... 369Adding Fuel.................................................... 177Additives, Fuel............................................... 413AdjustDown........................................................... 33Forward....................................................... 33Rearward..................................................... 33Up................................................................ 33Adjustable Pedals............................................ 38Advance Phone Connectivity......................... 242Air BagAir Bag Operation...................................... 299Air Bag Warning Light................................ 297Enhanced Accident Response......... 302, 341Event Data Recorder (EDR)....................... 341If Deployment Occurs................................ 302Knee Impact Bolsters................................ 299Maintaining Your Air Bag System.............. 303Maintenance............................................. 303Redundant Air Bag Warning Light.............297Transporting Pets...................................... 322
Air Bag Light................................ 103, 297, 322Air Cleaner, Engine
(Engine Air Cleaner Filter).................... 355, 375Air Conditioner Maintenance........................ 357Air Conditioner Refrigerant........................... 357Air Conditioner System................................. 357Air Conditioning................................................ 62Air Conditioning Filter....................................... 65Air Conditioning System................................... 64Air Conditioning, Operating Tips....................... 64Air Filter........................................................ 355Air PressureTires......................................................... 397AlarmPanic........................................................... 16Security Alarm....................................23, 104Alterations/ModificationsVehicle......................................................... 10Antifreeze (Engine Coolant).......................... 368Capacities................................................. 418Disposal................................................... 370Anti-Lock Brake System (ABS)...................... 270Anti-Lock Warning Light................................ 108
Assist, Hill Start............................................. 276Audio Settings............................................... 230Audio Systems (Radio).................................. 199Auto Down Power Windows..............................75Automatic Door Locks......................................27Automatic Folding Mirrors................................44Automatic Headlights.......................................52Automatic Temperature Control (ATC)..............64Automatic Transmission....................... 132, 373Adding Fluid.............................................. 373Fluid And Filter Change............................. 373Fluid Change............................................. 373Fluid Level Check...................................... 372Fluid Type........................................ 373, 421Shifting..................................................... 135Special Additives...................................... 372Automatic Transmission Limp Home Mode... 133AutoPark....................................................... 113AUX Camera......................................... 173, 176Auxiliary Driving Systems.............................. 277Axle Fluid.............................................. 374, 421Axle Lubrication............................................ 374

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