Jeep Wrangler (2018 year). Manual — part 26
WARNING!
Fast spinning tires can be dangerous. Forces generated
by excessive wheel speeds may cause damage, or even
failure, of the axle and tires. A tire could explode and
injure someone. Do not spin your vehicle’s wheels
faster than 30 mph (48 km/h) or for longer than 30
seconds continuously without stopping when you are
stuck and do not let anyone near a spinning wheel, no
matter what the speed.
CAUTION!
• Racing the engine or spinning the wheels may lead
to transmission overheating and failure. Allow the
engine to idle with the transmission in NEUTRAL
for at least one minute after every five rocking-
motion cycles. This will minimize overheating and
reduce the risk of clutch or transmission failure
during prolonged efforts to free a stuck vehicle.
• When “rocking” a stuck vehicle by shifting between
DRIVE/SECOND GEAR and REVERSE, do not spin
the wheels faster than 15 mph (24 km/h), or drive-
train damage may result.
• Revving the engine or spinning the wheels too fast
may lead to transmission overheating and failure. It
can also damage the tires. Do not spin the wheels
above 30 mph (48 km/h) while in gear (no transmis-
sion shifting occurring).
406
IN CASE OF EMERGENCY
TOWING A DISABLED VEHICLE
This section describes procedures for towing a disabled
vehicle using a commercial towing service. If the transmis-
sion and drivetrain are operable, disabled vehicles may
also be towed as described under “Recreational Towing” in
the “Starting And Operating” section.
Towing Condition
Wheels OFF The Ground
4WD MODELS
Flat Tow
NONE
See instructions under “Recreational Towing” in
“Starting And Operating”.
• Automatic Transmission in PARK
• Manual Transmission in gear ( NOT in NEU-
TRAL)
• Transfer Case in NEUTRAL
• Tow in forward direction
Wheel Lift Or Dolly Tow
Front
NOT ALLOWED
Rear
NOT ALLOWED
Flatbed
ALL
BEST METHOD
Proper towing or lifting equipment is required to prevent
damage to your vehicle. Use only tow bars and other
equipment designed for this purpose, following equipment
manufacturer’s instructions. Use of safety chains is man-
datory. Attach a tow bar or other towing device to main
structural members of the vehicle, not to bumpers or
associated brackets. State and local laws regarding vehicles
under tow must be observed.
If you must use the accessories (wipers, defrosters, etc.)
while being towed, the ignition must be in the ON/RUN
position, not the ACC position.
If the key fob is unavailable, or the vehicle’s battery is
discharged, refer to
⬙Manual Park Release⬙ in this section
for instructions on shifting the transmission out of PARK in
order to move the vehicle.
7
IN CASE OF EMERGENCY
407
CAUTION!
• Do not use sling type equipment when towing.
Vehicle damage may occur.
• When securing the vehicle to a flat bed truck, do not
attach to front or rear suspension components. Dam-
age to your vehicle may result from improper towing.
Four–Wheel Drive Models
The manufacturer recommends towing with all wheels
OFF
the ground. Acceptable methods are to tow the vehicle
on a flatbed or with one end of the vehicle raised and the
opposite end on a towing dolly.
If flatbed equipment is not available and the transfer case
is operable, the vehicle may be towed (in the forward
direction, with ALL wheels on the ground), IF the transfer
case is in NEUTRAL (N) and the transmission is in PARK
(for automatic transmissions) or in gear ( NOT in NEU-
TRAL
, for manual transmissions). Refer to “Recreational
Towing” in “Starting And Operating” for detailed instruc-
tions.
CAUTION!
• Front or rear wheel lifts must not be used (if the
remaining wheels are on the ground). Internal dam-
age to the transmission or transfer case will occur if
a front or rear wheel lift is used when towing.
• Towing this vehicle in violation of the above require-
ments can cause severe transmission and/or transfer
case damage. Damage from improper towing is not
covered under the New Vehicle Limited Warranty.
Emergency Tow Hooks — If Equipped
If your vehicle is equipped with tow hooks, they are
mounted in the front and the rear.
NOTE:
For off-road recovery, it is recommended to use
both of the front tow hooks to minimize the risk of damage
to the vehicle. Always use an appropriately rated tow
strap.
408
IN CASE OF EMERGENCY
WARNING!
• Do not use a chain for freeing a stuck vehicle. Chains
may break, causing serious injury or death.
• Stand clear of vehicles when pulling with tow hooks.
Tow straps may become disengaged, causing serious
injury.
CAUTION!
Tow hooks are for emergency use only, to rescue a
vehicle stranded off road. Do not use tow hooks for
tow truck hookup or highway towing. You could
damage your vehicle. Tow straps are recommended
when towing the vehicle, chains may cause vehicle
damage.
ENHANCED ACCIDENT RESPONSE SYSTEM
(EARS)
This vehicle is equipped with an Enhanced Accident
Response System.
Please refer to “Occupant Restraint Systems” in “Safety”
for further information on the Enhanced Accident Re-
sponse System (EARS) function.
EVENT DATA RECORDER (EDR)
This vehicle is equipped with an Event Data Recorder
(EDR). The main purpose of an EDR is to record data that
will assist in understanding how a vehicle’s systems per-
formed under certain crash or near crash-like situations,
such as an air bag deployment or hitting a road obstacle.
Please refer to “Occupant Restraint Systems” in “Safety”
for further information on the Event Data Recorder (EDR).
7
IN CASE OF EMERGENCY
409
SERVICING AND MAINTENANCE
CONTENTS
䡵 SCHEDULED SERVICING . . . . . . . . . . . . . . . . .413
▫ Maintenance Plan. . . . . . . . . . . . . . . . . . . . . . .414
▫ Heavy Duty Use Of The Vehicle . . . . . . . . . . . .418
䡵 ENGINE COMPARTMENT . . . . . . . . . . . . . . . . .419
▫ 2.0L Engine . . . . . . . . . . . . . . . . . . . . . . . . . . .419
▫ 3.6L Engine . . . . . . . . . . . . . . . . . . . . . . . . . . .420
▫ Checking Oil Level . . . . . . . . . . . . . . . . . . . . .421
▫ Adding Washer Fluid . . . . . . . . . . . . . . . . . . .421
▫ Maintenance-Free Battery . . . . . . . . . . . . . . . . .421
䡵 DEALER SERVICE . . . . . . . . . . . . . . . . . . . . . . .422
▫ Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . .423
▫ Engine Oil Filter . . . . . . . . . . . . . . . . . . . . . . .425
▫ Engine Air Cleaner Filter . . . . . . . . . . . . . . . . .425
▫ Accessory Drive Belt Inspection . . . . . . . . . . . .427
▫ Air Conditioner Maintenance . . . . . . . . . . . . . .428
▫ Body Lubrication . . . . . . . . . . . . . . . . . . . . . .432
▫ Windshield Wiper Blades . . . . . . . . . . . . . . . . .432
▫ Exhaust System . . . . . . . . . . . . . . . . . . . . . . . .436
▫ Cooling System . . . . . . . . . . . . . . . . . . . . . . . .438
▫ Brake System . . . . . . . . . . . . . . . . . . . . . . . . .443
▫ Front/Rear Axle Fluid . . . . . . . . . . . . . . . . . . .444
▫ Transfer Case . . . . . . . . . . . . . . . . . . . . . . . . .445
▫ Manual Transmission . . . . . . . . . . . . . . . . . . . .445
▫ Automatic Transmission . . . . . . . . . . . . . . . . . .446
䡵 RAISING THE VEHICLE . . . . . . . . . . . . . . . . . .447
䡵 TIRES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .447
▫ Tire Safety Information . . . . . . . . . . . . . . . . . .447
▫ Tires — General Information . . . . . . . . . . . . . .456
8
▫ Tire Types . . . . . . . . . . . . . . . . . . . . . . . . . . . .462
▫ Spare Tires — If Equipped . . . . . . . . . . . . . . . .464
▫ Wheel And Wheel Trim Care . . . . . . . . . . . . . .466
▫ Tire Chains (Traction Devices) . . . . . . . . . . . . .467
▫ Tire Rotation Recommendations . . . . . . . . . . . .468
䡵 DEPARTMENT OF TRANSPORTATION UNIFORM
TIRE QUALITY GRADES . . . . . . . . . . . . . . . . . .469
▫ Treadwear . . . . . . . . . . . . . . . . . . . . . . . . . . . .469
▫ Traction Grades . . . . . . . . . . . . . . . . . . . . . . . .469
▫ Temperature Grades . . . . . . . . . . . . . . . . . . . . .469
䡵 STORING THE VEHICLE . . . . . . . . . . . . . . . . . .470
䡵 BODYWORK . . . . . . . . . . . . . . . . . . . . . . . . . . .470
▫ Protection From Atmospheric Agents . . . . . . . .470
▫ Body And Underbody Maintenance . . . . . . . . . .471
▫ Preserving The Bodywork . . . . . . . . . . . . . . . . .471
䡵 INTERIORS . . . . . . . . . . . . . . . . . . . . . . . . . . . .474
▫ Carpet Removal . . . . . . . . . . . . . . . . . . . . . . .474
▫ Seats And Fabric Parts . . . . . . . . . . . . . . . . . . .482
▫ Plastic And Coated Parts. . . . . . . . . . . . . . . . . .482
▫ Leather Parts . . . . . . . . . . . . . . . . . . . . . . . . . .483
▫ Glass Surfaces . . . . . . . . . . . . . . . . . . . . . . . . .483
412
SERVICING AND MAINTENANCE
SCHEDULED SERVICING
Your vehicle is equipped with an automatic oil change
indicator system. The oil change indicator system will
remind you that it is time to take your vehicle in for
scheduled maintenance.
Based on engine operation conditions, the oil change
indicator message will illuminate. This means that service
is required for your vehicle. Operating conditions such as
frequent short-trips, trailer tow, extremely hot or cold
ambient temperatures will influence when the “Change
Oil” or “Oil Change Required” message is displayed.
Severe Operating Conditions can cause the change oil
message to illuminate as early as 3,500 miles (5,600 km)
since last reset. Have your vehicle serviced as soon as
possible, within the next 500 miles (805 km).
On vehicles equipped with instrument cluster display, “Oil
Change Required” will be displayed and a single chime
will sound, indicating that an oil change is necessary.
On non-instrument cluster display equipped vehicles,
“Change Oil” will flash in the instrument cluster odometer
and a single chime will sound, indicating that an oil change
is necessary.
An authorized dealer will reset the oil change indicator
message after completing the scheduled oil change. If a
scheduled oil change is performed by someone other than
an authorized dealer, the message can be reset by referring
to the steps described under “Instrument Cluster Display”
in “Getting To Know Your Instrument Panel” for further
information.
NOTE:
Under no circumstances should oil change inter-
vals exceed 10,000 miles (16,000 km), twelve months or 350
hours of engine run time, whichever comes first. The 350
hours of engine run or idle time is generally only a concern
for fleet customers.
Severe Duty All Models
Change Engine Oil at 4,000 miles (6,500 km) or 350 hours of
engine run time if the vehicle is operated in a dusty and off
road environment or is operated predominately at idle or
only very low engine RPM’s. This type of vehicle use is
considered Severe Duty.
8
SERVICING AND MAINTENANCE
413
Once A Month Or Before A Long Trip:
• Check engine oil level
• Check windshield washer fluid level
• Check the tire inflation pressures and look for unusual
wear or damage
• Check the fluid levels of the coolant reservoir, brake
master cylinder, and power steering, and fill as needed
• Check function of all interior and exterior lights
Maintenance Plan
Required Maintenance Intervals
Refer to the maintenance plan on the following pages for
the required maintenance intervals.
At Every Oil Change Interval As Indicated By Oil
Change Indicator System:
• Change oil and filter
• Rotate the tires
Rotate at the first sign of irregular wear, even if it
occurs before the oil indicator system turns on
• Inspect battery and clean and tighten terminals as
required
• Inspect brake pads, shoes, rotors, drums, hoses and
park brake
• Inspect engine cooling system protection and hoses
• Inspect exhaust system
• Inspect engine air cleaner if using in dusty or
off-road conditions
• Inspect all door latches for presence of grease,
reapply if necessary.
414
SERVICING AND MAINTENANCE
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
1
10,000
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
1
12,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
Additional Inspections
Inspect the CV/Universal joints.
X
X
X
X
X
X
X
Inspect front suspension, tie rod
ends, and replace if necessary.
X
X
X
X
X
X
X
Inspect the front and rear axle
fluid.
X
X
X
X
Inspect the brake linings, replace
as necessary
X
X
X
X
X
X
X
Adjust parking brake on vehicles
equipped with four wheel disc
brakes.
X
X
X
X
X
X
X
Inspect transfer case fluid.
X
X
X
Additional Maintenance
Replace engine air cleaner filter.
X
X
X
X
X
Replace air conditioning/cabin air
filter.
X
X
X
X
X
X
X
Replace Spark Plugs –
2.0L Engine**
X
X
X
X
X
8
SERVICING AND MAINTENANCE
415
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
1
10,000
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
1
12,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
Replace spark plugs – 3.6L En-
gine**
X
Flush and replace the engine, in-
tercooler (if equipped), battery (if
equipped), and Motor Generator
Unit (MGU) (if equipped) coolant
at 10 years or 150,000 miles
(240,000 km) whichever comes
first.
X
X
Change the manual transmission
fluid if using your vehicle for any of
the following: trailer towing, snow
plowing, heavy loading, taxi, po-
lice, delivery service (commercial
service), off-road, desert operation
or more than 50% of your driving
is at sustained high speeds during
hot weather, above 90°F (32°C).
X
X
X
X
X
416
SERVICING AND MAINTENANCE
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
1
10,000
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
1
12,000
128,000
144,000
160,000
176,000
192,000
208,000
224,000
240,000
Change transfer case fluid if using
your vehicle for any of the follow-
ing: police, taxi, fleet, or frequent
trailer towing.
X
X
Inspect and replace PCV valve if
necessary.
X
Change front and rear axle fluid if
using your vehicle for police, taxi,
fleet, off-road or frequent trailer
towing.
X
X
X
** The spark plug change interval is mileage based only,
yearly intervals do not apply.
8
SERVICING AND MAINTENANCE
417
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 me-
chanic.
• Failure to properly inspect and maintain your vehicle
could result in a component malfunction and effect
vehicle handling and performance. This could cause
an accident.
Heavy Duty Use Of The Vehicle
Change engine oil at 4,000 miles (6,500 km) or 350 hours of
engine run time if the vehicle is operated in a dusty and off
road environment or is operated predominately at idle or
only very low engine RPM’s. This type of vehicle use is
considered Severe Duty.
418
SERVICING AND MAINTENANCE
ENGINE COMPARTMENT
2.0L Engine
1 — Power Distribution Center (Fuses)
8 — Power Pack Unit Pressure Cap — If Equipped
2 — Battery
9 — Power Pack Unit Pressure Reservoir — If Equipped
3 — Engine Oil Dipstick
10 — Washer Fluid Reservoir
4 — Engine Oil Fill
11 — Intercooler/Motor Generator Unit (If Equipped) Coolant Pressure Cap
5 — Engine Coolant Reservoir
12 — Intercooler/Motor Generator Unit (If Equipped) Coolant Reservoir
6 — Engine Coolant Pressure Cap
13 — Power Steering Fluid Reservoir
7 — Brake Fluid Reservoir
14 — Engine Air Cleaner
8
SERVICING AND MAINTENANCE
419
3.6L Engine
1 — Power Distribution Center (Fuses)
8 — Power Pack Unit Pressure Cap — If Equipped
2 — Battery
9 — Power Pack Unit Pressure Reservoir — If Equipped
3 — Engine Oil Dipstick
10 — Washer Fluid Reservoir
4 — Engine Oil Fill
11 — Motor Generator Unit Coolant Pressure Cap — If Equipped
5 — Engine Coolant Reservoir
12 — Motor Generator Unit Coolant Reservoir — If Equipped
6 — Engine Coolant Pressure Cap
13 — Power Steering Fluid Reservoir
7 — Brake Fluid Reservoir
14 — Engine Air Cleaner
420
SERVICING AND MAINTENANCE
Checking Oil Level
To ensure proper lubrication of your vehicle’s engine, the
engine oil must be maintained at the correct level. The
engine oil level should be checked five minutes after a
warmed up engine has been shut off.
Checking the oil while the vehicle is on level ground will
improve the accuracy of the oil level readings. Always
maintain the oil level within the SAFE zone on the dipstick.
Adding 1 quart (0.95 liters) of oil when the reading is at the
bottom of the crosshatch zone will result in a reading at the
top of the crosshatch zone on these engines.
CAUTION!
Overfilling or underfilling the crankcase will cause
aeration or loss of oil pressure. This could damage your
engine.
Adding Washer Fluid
The fluid reservoir for the windshield washers and the rear
window washer (if equipped) is shared. The fluid reservoir
is located in the engine compartment. Be sure to check the
fluid level at regular intervals. Fill the reservoir with
windshield washer solvent only (not radiator antifreeze).
When refilling the washer fluid reservoir, take some
washer fluid and apply it to a cloth or towel and wipe clean
the wiper blades; this will help blade performance.
To prevent freeze-up of your windshield washer system in
cold weather, select a solution or mixture that meets or
exceeds the temperature range of your climate. This rating
information can be found on most washer fluid containers.
WARNING!
Commercial windshield washer solvents are flam-
mable. They could ignite and burn you. Care must be
exercised when filling or working around the washer
solution.
Maintenance-Free Battery
Your vehicle is equipped with a maintenance-free battery.
You will never have to add water, nor is periodic mainte-
nance required.
8
SERVICING AND MAINTENANCE
421
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