2023 JEEP WRANGLER oil viscosity

STARTING AND OPERATING131
COLD WEATHER PRECAUTIONS
Operation in ambient temperature below 32°F (0°C) may
require special considerations. The following charts
suggest these options:
Fuel Operating Range
NOTE:Use Ultra Low Sulfur Diesel (ULSD) Fuels ONLY.

Fuel Operating Range Chart

*Number 1 ULSD Fuel should only be used where extended arctic
conditions 0°F (-18°C) exist.
NOTE:
Use of Climatized ULSD Fuel or Number 1 ULSD Fuel
results in a noticeable decrease in fuel economy.
 Climatized ULSD Fuel is a blend of Number 2 ULSD
Fuel and Number 1 ULSD Fuel which reduces the
temperature at which wax crystals form in fuel.
 The fuel grade should be clearly marked on the pump
at the fuel station.
 The engine requires the use of Ultra Low Sulfur Diesel
Fuel . Use of incorrect fuel could result in engine and
exhaust system damage
Úpage 371.
 If climatized or Number 1 ULSD Fuel is not available,
and you are operating below 20°F (-6°C), in sustained
arctic conditions, Mopar® Premium Diesel Fuel Treat -
ment (or equivalent) is recommended to avoid gelling
(see Fuel Operating Range Chart).
Engine Oil Usage
See Engine Fluids and Lubricants for the correct engine oil
viscosity Úpage 374.
Winter Front Cover
A Winter front or cold weather cover can be used in
ambient temperatures below 32°F (0°C), especially
during extended idle conditions. This cover is equipped
with four flaps for managing total grille opening in varying
ambient temperatures. If a Winter front or cold weather
cover is to be used, the flaps should be in the full open
position to allow air flow to the cooling module and automatic transmission oil cooler. When ambient
temperatures drop below 0°F (-17°C) the four flaps need
to be closed. A suitable cold weather cover is available
from a Mopar® dealer.
Engine Warm-Up
Avoid full throttle operation when the engine is cold. When
starting a cold engine, bring the engine up to operating
speed slowly to allow the oil pressure to stabilize as the
engine warms up.
If temperatures are below 32°F (0°C), operate the engine
at moderate speeds for five minutes before full loads are
applied.
ENGINE IDLING
Avoid prolonged idling. Long periods of idling may be
harmful to your engine because combustion chamber
temperatures can drop so low that the fuel may not burn
completely. Incomplete combustion allows carbon and
varnish to form on piston rings, cylinder head valves, and
injector nozzles. Also, the unburned fuel can enter the
crankcase, diluting the oil and causing rapid wear to the
engine.
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STARTING AND OPERATING133
Do Not Operate The Engine With Failed
Parts
All engine failures give some warning before the parts fail.
Be on the alert for changes in performance, sounds, and
visual evidence that the engine requires service. Some
important clues are:
Engine misfiring or vibrating severely
 Sudden loss of power
 Unusual engine noises
 Fuel, oil or coolant leaks
 Sudden change, outside the normal operating range, in
the engine operating temperature
 Excessive smoke
 Oil pressure drop
ENGINE BREAK-IN RECOMMENDATIONS —
GASOLINE ENGINE (IF EQUIPPED)
A long break-in period is not required for the engine and
drivetrain (transmission and axle) in your vehicle.
Drive moderately during the first 300 miles (500 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws contributes to a good break-in.
Wide-open throttle acceleration in low gear can be
detrimental and should be avoided.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil changes
should be consistent with anticipated climate conditions
under which vehicle operations will occur. For the recommended viscosity and quality grades
Úpage 374.
NOTE:A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered a normal part of the break-in and not inter
-
preted as a problem.
ENGINE BREAK-IN RECOMMENDATIONS —
DIESEL ENGINE (IF EQUIPPED)
The diesel engine does not require a break-in period due
to its construction. Normal operation is allowed, providing
the following recommendations are followed:
 Warm up the engine before placing it under load.
 Do not operate the engine at idle for prolonged periods.
 Use the appropriate transmission gear to prevent
engine lugging.
 Observe vehicle oil pressure and temperature indica -
tors.
 Check the coolant and oil levels frequently.
 Vary throttle position at highway speeds when carrying
or towing significant weight.
NOTE:Light duty operation such as light trailer towing or no load
operation will extend the time before the engine is at full
efficiency. Reduced fuel economy and power may be seen
at this time.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil changes
should be consistent with anticipated climate conditions
under which vehicle operations will occur. For
recommended viscosity and quality grades see
Úpage 374. NON-DETERGENT OR STRAIGHT MINERAL
OILS MUST NEVER BE USED.
PARKING BRAKE
Before exiting the vehicle, make sure that the parking
brake is fully applied. Also, be certain to leave an
automatic transmission in PARK, or manual transmission
in REVERSE or FIRST gear.
The parking brake lever is located in the center console.
To apply the parking brake, pull the lever up as firmly as
possible. To release the parking brake, pull the lever up
slightly, push the center button, then lower the lever
completely.
CAUTION!
Never use Non-Detergent Oil or Straight Mineral Oil in
the engine or damage may result.
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318SERVICING AND MAINTENANCE
PRESSURE WASHING
Cleaning the engine compartment with a high pressure
washer is not recommended.
VEHICLE MAINTENANCE
An authorized dealer has the qualified service personnel,
special tools, and equipment to perform all service
operations in an expert manner. Service Manuals are
available which include detailed service information for
your vehicle. Refer to these Service Manuals before
attempting any procedure yourself.
NOTE:Intentional tampering with emissions control systems may
void your warranty and could result in civil penalties being
assessed against you.
ENGINE OIL
Engine Oil Selection
For engine oil selection Úpage 374.
American Petroleum Institute (API)
Approved Engine Oil
These symbols mean that the oil has been certified by the
API. The manufacturer only recommends API trademark
oils.
The API Starburst trademark certifies 0W-20,
0W-30 and 5W-30 engine oils.
The API Donut trademark certifies 0W-40 and
5W-40 engine oil.
Synthetic Engine Oils
Your engine was designed for synthetic engine oils, only
use synthetic API approved engine oils.
Synthetic engine oils which do not have both the correct
API trademark and the correct SAE viscosity grade
numbers should not be used.
CAUTION!
It is essential when replacing the cables on the
battery that the positive cable is attached to the posi -
tive post and the negative cable is attached to the
negative post. Battery posts are marked positive (+)
and negative (-) and are identified on the battery
case. Cable clamps should be tight on the terminal
posts and free of corrosion.
 If a “fast charger” is used while the battery is in the
vehicle, disconnect both vehicle battery cables
before connecting the charger to the battery. Do not
use a “fast charger” to provide starting voltage.
 Vehicles with the Stop/Start system will be equipped
with two batteries. Both the main and the supple -
mental batteries must be disconnected to
completely de-energize the 12 Volt electrical system.
 If the negative battery cables are not isolated prop -
erly it can cause a potential power spike or surge in
the system, resulting in damage to essential elec -
trical components.
CAUTION!
Precautions have been taken to safeguard all parts and
connections however, the pressures generated by these
machines is such that complete protection against
water ingress cannot be guaranteed.
WARNING!
You can be badly injured working on or around a motor
vehicle. Only do service work for which you have the
knowledge and the proper equipment. If you have any
doubt about your ability to perform a service job, take
your vehicle to a competent mechanic.
CAUTION!
Do not use chemical flushes in your engine oil as the
chemicals can damage your engine. Such damage is
not covered by the New Vehicle Limited Warranty.

23_JL_OM_EN_USC_t.book Page 318

387
Modifications/AlterationsVehicle .......................................................................... 8
Monitor, Tire Pressure System .................................... 257
Mopar Parts .................................................................. 379
NNew Vehicle Break-In Period ....................................... 133
OOccupant Restraints .................................................... 261
Octane Rating, Gasoline (Fuel) .......................... 369, 374
Off Road Pages ............................................................ 241 Accessory Gauges.......................................... 241
, 242
Drivetrain........................................................ 241, 242
Pitch And Roll ................................................. 241, 242
Status Bar ............................................................... 241
Oil Change Reset — If Equipped

S
.......................... 110
Oil Filter, Change .......................................................... 319
Oil Filter, Selection ....................................................... 319
Oil Pressure Light ......................................................... 118
Oil Reset ....................................................................... 110
Oil, Engine............................................................ 318
, 374
Capacity ................................................................... 373
Checking .................................................................. 317
Dipstick.................................................................... 317
Disposal................................................................... 319
Filter......................................................................... 319
Filter Disposal ......................................................... 319 Identification Logo .................................................. 318Materials Added To................................................. 319Pressure Warning Light .......................................... 118Recommendation .......................................... 318
, 373 Synthetic .................................................................. 318
Viscosity ...................................................................373
Onboard Diagnostic System......................................... 124
Operating Precautions..................................................124
Operator Manual Owner's Manual ....................................................... 380
Outside Rearview Mirrors............................................... 46
PPaddle Shifters ............................................................. 140
Paint Care...................................................................... 360
Pair (Link) Uconnect Phone To A Mobile
Phone

S
.....................................................................214
Parking Brake ............................................................... 133
ParkSense System, Rear.............................................. 160
Passive Entry................................................................... 21 Personalized Main Menu Bar....................................... 200
Pets ................................................................................ 288
Phone Mode .................................................................. 212
Placard, Tire And Loading Information ........................ 349
Power Brakes ...................................................................... 368
Door Locks ................................................................. 21
Inverter ....................................................................... 63
Mirrors ........................................................................ 46
Steering ....................................................................146 Windows..................................................................... 65
Power Sliding Top ........................................................... 91 Operation ................................................................... 91
Pinch Protect ............................................................. 91
Quarter Window Removal ......................................... 93
Power Steering Fluid ....................................................376 Po
w er Top Quarter Windows ......................................... 93
Pregnant Women And Seat Belts ................................ 265
Preparation For Jacking ............................................... 294
Presets .......................................................................... 207
Pretensioners Seat Belts ................................................................ 265
RRadial Ply Tires ............................................................. 353
Radiator Cap (Coolant Pressure Cap) ......................... 330
RadioPresets ..................................................................... 207
Radio Controls .............................................................. 201
Radio Mode .................................................................. 201
Radio Operation ..................................................201
, 240
Radio Remote Controls ................................................ 201
Raising The Soft Top

S
............................................... 77
Rear Axle (Differential) ................................................. 332
Rear Camera................................................................. 163
Rear Cross Path............................................................ 254
Rear ParkSense System .............................................. 160
Rear Seat Reminder Alert ............................................ 244
Rear Swing Gate ........................................................... 101
Rear Wiper/Washer ....................................................... 54 Recreational Towing ..................................................... 176 Shifting Into Transfer Case Neutral (N) ................. 177
Shifting Out Of Transfer Case Neutral (N) ............. 177
Reformulated Gasoline ................................................ 369
Refrigerant .................................................................... 325
Registering SiriusXM Guardian ................................... 226
Release, Hood .............................................................. 100
Reminder, Seat Belt ..................................................... 261
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