2005 JEEP WRANGLER octane

aggressive tread designs such as those on On/Off Road
type tires. Rotation will increase tread life, help to main-
tain mud, snow, and wet traction levels, and contribute to
a smooth, quiet ride.
Follow the recommended tire rotation frequency for your
type of driving found in the “Maintenance Schedules”
Section of this manual. More frequent rotation is permis-
sible if desired. The reasons for any rapid or unusual
wear should be corrected prior to rotation being per-
formed.
The suggested rotation method is the “forward-cross”
shown in the following diagram.
FUEL REQUIREMENTS
Your engine is designed to meet all emis-
sions regulations and provide excellent
fuel economy and performance when us-
ing high quality unleaded gasoline having
an octane rating of 87. The use of premium
gasoline is not recommended. The use of
222 STARTING AND OPERATING

CAUTION!
DO NOT use gasoline containing METHANOL.
Gasoline containing methanol may damage critical
fuel system components.
MMT In Gasoline
MMT is a manganese containing metallic additive that is
blended into some gasoline to increase octane. Gasoline
blended with MMT provides no performance advantage
beyond gasoline of the same octane number without
MMT. Gasoline blended with MMT reduces spark plug
life and reduces emission system performance in some
vehicles. The manufacturer recommends that gasoline
without MMT be used in your vehicle. The MMT content
of gasoline may not be indicated on the gasoline pump,
therefore, you should ask your gasoline retailer whether
or not his/her gasoline contains MMT.It is even more important to look for gasoline without
MMT in Canada because MMT can be used at levels
higher than allowed in the United States. MMT is pro-
hibited in Federal and California reformulated gasoline.
Materials Added To Fuel
All gasoline sold in the United States is required to
contain effective detergent additives. Use of additional
detergents or other additives is not needed under normal
conditions.
Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle’s
performance:
224 STARTING AND OPERATING

•The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance,
damage the emission control system.
•An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your dealer for service assistance.
•The use of fuel additives which are now being sold as
octane enhancers is not recommended. Most of these
products contain high concentrations of methanol.
Fuel system damage or vehicle performance problems
resulting from the use of such fuels or additives is not
the responsibility of the manufacturer.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
Carbon Monoxide Warnings
WARNING!
Carbon monoxide (CO) in exhaust gases is deadly.
Follow the precautions below to prevent carbon
monoxide poisoning:
•Do not inhale exhaust gases. They contain carbon
monoxide, a colorless and odorless gas which can kill.
Never run the engine in a closed area, such as a
garage, and never sit in a parked vehicle with the
engine running for an extended period. If the vehicle is
stopped in an open area with the engine running for
more than a short period, adjust the ventilation system
to force fresh, outside air into the vehicle.
•Guard against carbon monoxide with proper mainte-
nance. Have the exhaust system inspected every time
STARTING AND OPERATING 225
5

RECOMMENDED FLUIDS, LUBRICANTS AND GENUINE PARTS
Engine
Component Fluid, Lubricant, or Genuine Part
Engine Coolant MoparAntifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid Or-
ganic Additive Technology)
Engine Oil API Certified SAE 5W-30 Engine Oil is recommended for the 2.4L engine. API
Certified SAE 10W-30 Engine Oil is recommended for the 4.0L engine. Meets
the requirements of DaimlerChrysler Material Standard MS-6395.
Spark Plugs Refer to the Vehicle Emission Control Information label in the engine compart-
ment.
Oil Filter (2.4L Engine) MoparOil Filter (P/N 4105409)
Oil Filter (4.0L Engine) MoparOil Filter (P/N 05281090)
Fuel Selection 87 Octane
296 MAINTAINING YOUR VEHICLE

Front Axle............................. 278
Fuel................................. 222
Filler Cap............................ 226
Filter............................... 260
Gasoline............................ 222
Gauge.............................. 148
Materials Added....................... 224
Octane Rating........................ 223
Requirements......................... 295
Tank Capacity........................ 295
Fuel System Caution...................224,227
Fuses................................ 286
GasCap .............................. 226
Gasoline.............................. 222
Gasoline, Reformulated................... 223
Gasoline/Oxygenate Blends................ 223
Gauges
Coolant Temperature.................... 145Fuel................................ 148
Odometer........................... 146
Oil Pressure.......................... 145
Speedometer......................... 144
Tachometer.......................... 143
Voltmeter............................ 143
Gear Ranges........................183,185
Glass Cleaning.......................... 283
Glove Compartment...................... 71
HardTop .............................. 86
Hard Top Removal....................... 87
Hazard Warning Flasher................... 236
Headlights
Bulb Replacement...................... 291
Dimmer Switch........................ 63
Replacing............................ 291
Switch............................... 62
Heater............................... 169
INDEX 337
10

Lower Anchors and Tether for CHildren
(LATCH)...........................37,38
Lubrication, Body....................... 264
Maintenance, Airbag...................... 33
Maintenance Free Battery.................. 261
Maintenance Procedures................... 253
Maintenance Schedule.................... 300
ScheduleA......................... 314
ScheduleB.......................... 303
Maintenance Schedules.................... 300
Malfunction Indicator Light..............145,251
Manual, Service......................... 328
Manual Transmission..................181,276
Fluid Level Check...................... 276
Lubricant Selection..................... 276
Shift Speeds.......................... 183
Master Cylinder......................... 273
Mirrors................................ 50Automatic Dimming..................... 50
Compass/Temperature................... 50
Outside.............................. 54
Rearview............................. 50
Modifications/Alterations, Vehicle............. 9
Mopar Parts.........................252,327
Multi-Function Control Lever................ 62
New Vehicle Break-In Period................ 44
Occupant Restraints....................... 19
Octane Rating, Gasoline................... 223
Odometer............................. 146
Trip ................................ 146
Off-Pavement Driving.................... 202
Off-Road Driving........................ 202
Oil, Engine............................ 253
Capacity............................ 295
Dipstick............................. 253
340 INDEX