
215
*  See  “Severe  Duty  Conditions”  in  this
section.
**  DOT  4  brake  fluid  is  time  based  only;
mileage intervals do not apply.***  The  spark  plug  change  interval  is
mileage  based  only,  yearly  intervals  do  not
apply.
****  This  maintenance  is  recommended  by
the  manufacturer  to  the  owner,  but  is  not
required to maintain emissions warranty.
Replace accessory drive 
belt(s).
X
Flush and replace the 
engine coolant at 10 
years or 150,000 miles 
(240,000 km) whichever 
comes first.
 X
X
Change transfer case fluid 
if using your vehicle for 
any of the following: 
police, taxi, fleet, or 
frequent trailer towing.
 X
X
Inspect and replace PCV 
valve if necessary. **** X
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: 12 24 36 48 60 72 84 96 108 120 132 144 156 168 180 192 204 216 228 240
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
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SERVICING AND MAINTENANCE
216
Severe Duty Conditions
Change the engine oil and engine oil filter at
every  4,500 miles  (7,500 km)  or  6 months
if  using  your  vehicle  under  any  of  the
following severe duty conditions:
Stop and go driving.
Driving in dusty conditions.
Short trips of less than 10 miles (16 km).
Trailer towing.
Taxi,  police,  or  delivery  service  (commer-
cial service).
Off-road or desert operation.
Scheduled Servicing — Diesel Engine  
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  engine  oil
replacement.
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.
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
“Oil  Change  Required”  message  is  displayed. Severe  Operating  Conditions  can  cause  the
change oil message to illuminate as earlier than
specified.  Have  your  vehicle  serviced  as  soon
as  possible,  within  the  next  500 miles
(805 km).
NOTE:
The actual interval for changing engine oil
and replacing the engine oil filter depends
on  the  vehicle  usage  conditions,  and  is
signaled  by  the  warning  light  or  message
in  the  instrument  panel.  In  any  case,  it
must  never  exceed  12,500 miles
(20,000 km) or 1 year
Flush  and  replace  the  engine  coolant  at
120 months or 150,000 miles (240,000 km)
whichever comes first.
The  maximum  mileage  is  75,000 mi
(120,000 km).  The  belt  must  be  replaced
every  5  years  regardless  of  distance  trav-
eled. The timing and accessory belts must be
changed every 37,500 miles (60,000 km) or
3  years  for  particularly  demanding  use
(dusty  areas,  severe  weather  conditions,
very  low  or  very  high  temperatures  for
extended  periods,  city  driving,  long  periods
of  idling).  Under  no  circumstances  should
these intervals be exceeded.
 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 compe-
tent mechanic.
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.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 216   

219
Additional Maintenance
Replace engine air cleaner filter.X X X X X X X
Replace air conditioning/cabin air filter. X X X X X X X
Change  brake  fluid  every  24 months  if  using  DOT  4
brake fluid. (**) X X X X X X X
Replace the engine fuel filter. X X X X X X X
Inspect accessory drive and timing belt. XX X
Replace accessory drive belt. (***) XX
Flush  and  replace  the  engine  coolant  at  10  years  or
150,000 miles (240,000 km) whichever comes first. X X
Replace timing drive belt. (***) XX
Mileage or time passed (whichever comes first)
12,500
25,000
37,500
50,000
62,500
75,000
87,500
100,000
112,500
125,000
137,500
150,000
162,500
175,000
187,500
Or Years: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Or Kilometers:
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
200,000
220,000
240,000
260,000
280,000
300,000
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 219   

SERVICING AND MAINTENANCE
220
(*)  The  actual  interval  for  changing  engine
oil  and  replacing  the  engine  oil  filter
depends  on  the  vehicle  usage  conditions,
and  is  signaled  by  the  warning  light  or
message  in  the  instrument  panel.  In  any
case,  it  must  never  exceed  12,500 miles
(20,000 km) or 1 year.
(**)  The  brake  fluid  interval  is  time  based
only, mileage intervals do not apply.(***)  The  maximum  mileage  is  75,000 mi
(120,000 km).  The  belt  must  be  replaced
every 5 years regardless of distance traveled.
The  timing  and  accessory  belts  must  be
changed every 37,500 miles (60,000 km) or
3 years for particularly demanding use (dusty
areas, severe weather conditions, very low or
very high temperatures for extended periods,
city driving, long periods of idling). Under no
circumstances  should  these  intervals  be
exceeded.
(°)  Consumption  of  additive  AdBlue®
(UREA)  depends  on  the  condition  of  use  of
the  vehicle  and  is  indicated  by  LED  and/or
message on the instrument panel. 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 compe-
tent mechanic.
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.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 220   

245
Care Of Fabric Top Windows
Your  vehicle's  fabric  top  has  pliable  plastic
windows  which  can  be  scratched  unless
special  care  is  taken  by  following  these
directions:
Never  use  a  dry  cloth  to  remove  dust.
Instead, use  a  microfiber  towel  or  soft
cotton  cloth  moistened  with  cold  or  warm,
clean  water,  and  wipe  across  the  window,
not up and down.  It removes fine scratches
to  improve  visibility  and  provides  UV
protection to help prevent yellowing.
When  washing,  never  use  hot  water   or
anything stronger than a mild soap. Never
use  solvents  such  as  alcohol  or  harsh
cleaning agents.
Always  rinse  thoroughly  with  cold  water,
then  wipe  with  a  soft  and  slightly  moist,
clean cloth.
When  removing  frost,  snow  or  ice,  never
use  a  scraper  or  de-icing  chemicals.   Use
warm  water  only  if  you  must  clean  the
window quickly.
Debris (sand, mud/dirt, dust, or salt) from
off-road  driving  will  have  an  impact  on
plastic  retainer  operation.  Even  normal
on-road  driving  and  vehicle  washing  will
eventually impact window  plastic  retainer
operation. To maintain  ease of  use of  the
window  plastic  retainers,  each  window
plastic  retainer  should  be  cleaned  and
lubricated  regularly.  Clean  them  with  a
mild  soap  solution  and  a  small  brush.
Cleaning  products  are  available  through
an authorized dealer.
Never  paste  stickers,  gummed  labels  or
any  tape  to  the  windows.  Adhesives  are
hard  to  remove  and  may  damage  the
windows.
INTERIORS 
Seats And Fabric Parts
Use a specific product to clean fabric uphol -
stery and carpeting.
Seat Belt Maintenance
Do  not  bleach,  dye  or  clean  the  belts  with
chemical solvents or  abrasive cleaners. This
will weaken the fabric. Sun damage can also
weaken the fabric.
If  the  belts  need  cleaning,  use  a  mild  soap
solution  or  lukewarm  water.  Do  not  remove
the belts from the vehicle to wash them. Dry
with a soft cloth.
Replace  the  belts  if  they  appear  frayed  or
worn or if the buckles do not work properly.
Do not use pure windshield washer fluid
for  cleaning  the  front  windshield  and
rear  window;  dilute  it  min.  50%  with
water.  Only  use  pure  windshield  washer
fluid  when  strictly  necessary  due  to
outside temperature conditions.
 CAUTION! (Continued)
 WARNING!
Do  not  use  volatile  solvents  for  cleaning
purposes. Many are potentially flammable,
and if used in closed areas they may cause
respiratory harm.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 245   

SERVICING AND MAINTENANCE
246
Plastic And Coated Parts
Use a  specific product  to  clean  vinyl uphol-
stery.
Cleaning Plastic Instrument Cluster Lenses 
The lenses in front of the instruments in this
vehicle  are  molded  in  clear  plastic.  When
cleaning  the  lenses,  care  must  be  taken  to
avoid scratching the plastic.
1. Clean with a  wet soft  cloth.  A  mild soap solution  may  be  used,  but  do  not  use
high  alcohol  content  or  abrasive
cleaners. If soap is used, wipe clean with
a clean damp cloth.
2. Dry with a soft cloth.
Leather Parts
Your  leather  upholstery  can  be  best
preserved  by  regular  cleaning  with  a  damp
soft cloth.  Small  particles  of dirt  can  act as
an  abrasive  and  damage  the  leather  uphol -
stery and should be removed promptly with a
damp  cloth.  Care  should  be  taken  to  avoid
soaking  your  leather  upholstery  with  any
liquid.  Please  do  not  use  polishes,  oils,
cleaning  fluids,  solvents,  detergents,  or
ammonia-based  cleaners  to  clean  your
leather  upholstery.  Application  of  a  leather
conditioner  is  not  required  to  maintain  the
original condition. NOTE:
If  equipped  with  light  colored  leather,  it
tends to show any foreign material, dirt, and
fabric  dye  transfer  more  so  than  darker
colors.  The  leather  is  designed  for  easy
cleaning.
Glass Surfaces 
All  glass  surfaces  should  be  cleaned  on  a
regular  basis  with  any  commercial  house
-
hold-type  glass  cleaner.  Never  use  an  abra -
sive type cleaner. Use caution when cleaning
the  inside  rear  window  equipped  with  elec -
tric  defrosters  or  windows  equipped  with
radio antennas. Do not use scrapers or other
sharp  instruments  that  may  scratch  the
elements.
When  cleaning  the  rear  view  mirror,  spray
cleaner  on  the  towel  or  cloth  that  you  are
using.  Do  not  spray  cleaner  directly  on  the
mirror.
 WARNING!
A  frayed  or  torn  belt  could  rip  apart  in  a
collision and leave  you with no protection.
Inspect  the  belt  system  periodically,
checking  for  cuts,  frays,  or  loose  parts.
Damaged  parts  must  be  replaced
immediately. Do not disassemble or modify
the  system.  Seat  belt  assemblies  must  be
replaced after a collision if they have been
damaged  (i.e.,  bent  retractor,  torn
webbing, etc.).
 CAUTION!
Direct  contact  of  air  fresheners,  insect
repellents,  suntan  lotions,  or  hand  sani -
tizers  to the plastic, painted, or decorated
surfaces  of  the  interior  may  cause  perma -
nent damage. Wipe away immediately.
Damage  caused  by  these  type  of  prod -
ucts  may  not  be  covered  by  your  New
Vehicle Limited Warranty.
 CAUTION!
Do not use Alcohol and Alcohol-based and/
or  Ketone  based  cleaning  products  to
clean leather upholstery, as damage to the
upholstery may result.
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319
INDEX
A
Accessories ....................................... 258Mopar ........................................... 258
Active Speed Limiter .......................... 156
Adaptive Cruise Control (ACC) 
(Cruise Control) ................................. 158
Adding Fuel ...................................... 169
Additives, Fuel .................................. 249
Air Bag Air Bag Operation ........................... 107Air Bag Warning Light ..................... 105
Disable, Passenger Air Bag.............. 107
Enhanced Accident Response ... 115 , 209
Event Data Recorder (EDR) ............. 209
Front Air Bag ................................. 106
If Deployment Occurs ..................... 114
Knee Impact Bolsters ..................... 112
Maintaining Your Air Bag System ..... 116
Maintenance .................................. 116
Redundant Air Bag Warning Light .... 105
Transporting Pets ........................... 134
Air Bag Light ........................65 , 105 , 136
Air Conditioning................................... 44
Air Conditioning Filter .......................... 46
Air Conditioning System ....................... 44
Air Conditioning, Operating Tips ............ 45 Air Pressure
Tires ............................................. 233
Alarm Arm The System .............................. 15
Disarm The System .......................... 15
Security Alarm ............................15 , 68
Alarm (Security Alarm) ......................... 16
Alterations/Modifications Vehicle ............................................. 2
Android Auto...................... 266 , 271 , 302
Apps ............................................. 274
Communication ............................. 273
Maps ............................................ 272
Music ........................................... 273
Antifreeze (Engine Coolant) ................ 253
Anti-Lock Brake System (ABS) .............. 78
Anti-Lock Warning Light ....................... 68
Apple CarPlay .................... 267 , 274 , 303
Apps ............................................. 276
Maps ............................................ 276
Messages ...................................... 275
Music ........................................... 275
Phone ........................................... 275
Assist, Hill Start .................................. 85
Audio Systems (Radio) ................260 , 262
Auto Down Power Windows ................... 46
Automatic Headlights .......................... 33 Automatic High Beams .........................33
Automatic Temperature Control (ATC) ....44
Automatic Transmission......................145
Fluid Level Check ................... 231 , 232
Fluid Type ............................. 231 , 257
Special Additives ............................231
Auxiliary Electrical Outlet (Power Outlet)... 56
Auxiliary Power Outlet ..........................56
Auxiliary Switches ................................58
Axle Fluid..........................................257
Axle Lock ..........................................151
B
Battery ........................................ 66 , 225
Charging System Light ......................66
Belts, Seat ........................................136
Blind Spot Monitoring ..........................87
Brake Assist System .............................79
Brake Control System ...........................79
Brake Fluid ............................... 230 , 257
Brake System ....................................230 Fluid Check ...................................230
Master Cylinder ..............................230
Warning Light...................................65
Brake/Transmission Interlock...............144
Bulb Replacement ..................... 179 , 181
Bulbs, Light .............................. 137 , 179
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322
INDEX
I
Ignition ............................................... 12Switch ............................................ 12
Installation.......................................... 51
Installing ............................................ 53
Instrument Cluster ............................... 61 Descriptions .................................... 74
Display ............................................ 60
Menu Items ..................................... 61
Instrument Panel Lens Cleaning .......... 246
Integrated Power Module (Fuses)......... 184
Interior Appearance Care .................... 245
Intermittent Wipers (Delay Wipers) ........ 35
Introduction .......................................... 1
Inverter Power.............................................. 57
J
Jack Location .................................... 193
Jack Operation .......................... 195 , 232
Jacking Instructions ........................... 195
Jump Starting ................................... 201 K
Key Fob
Arm The System .............................. 15
Disarm The System .......................... 15
Keyless Enter-N-Go.............................. 18 Passive Entry ................................... 18
Keys................................................... 11 Replacement ................................... 12
L
Lap/Shoulder Belts ............................ 100
Latches ............................................ 137 Hood .............................................. 55
Leaks, Fluid ...................................... 137
Leveling Headlights....................................... 34
Life Of Tires...................................... 235
Light Bulbs ................................137 , 179
Lights............................................... 137 Air Bag ............................ 65 , 105 , 136
Automatic Headlights ....................... 33
Brake Assist Warning........................ 82
Brake Warning ................................. 65
Bulb Replacement ..................179 , 181
Center Mounted Stop ..................... 183 Cruise ........................................74 , 76 Daytime Running ..............................32
Dimmer Switch, Headlight.................32
Electronic Stability Program (ESP) 
Indicator ......................................67
Engine Temperature Warning .............67 Exterior.................................... 32 , 137
Fog ......................................... 72 , 182
Hazard Warning Flasher ..................179
Headlight Leveling ............................34
Headlights .....................................181
High Beam.......................................32
High Beam/Low Beam Select .............32 Hill Descent Control Indicator ............83Lights On Reminder ..........................34
Malfunction Indicator  (Check Engine) .............................69
Park ................................................74
Passing............................................33 Rear Servicing ................................182
Rear Tail Lamps .............................182
Seat Belt Reminder .............. 67 , 74 , 75
Security Alarm .................................68
Service .................................. 179 , 181
Side Marker ...................................182
Tire Pressure Monitoring (TPMS) ........92
Traction Control................................82
Turn Signal ....................................137
Turn Signals..................... 74 , 181 , 182
Warning Instrument Cluster Descriptions ........................... 67 , 74
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book  Page 322