2004 JEEP WRANGLER octane

Follow the recommended tire rotation frequency for your
type of driving found in the ªMaintenance Schedulesº
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 ªforward-crossº
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
premium gasoline will provide no benefit over high
quality regular gasoline, and in some circumstances may
result in poorer performance.
Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Engine damage resulting from operation with a
heavy spark knock may not be covered by the new
vehicle warranty.
Poor quality gasoline can cause problems such as hard
starting, stalling and hesitations. If you experience these
symptoms, try another brand of gasoline before consid-
ering service for the vehicle.
STARTING AND OPERATING 197
5

Over 40 auto manufacturer's world wide have issued and
endorsed consistent gasoline specifications (the World-
wide Fuel Charter, WWFC) to define fuel properties
necessary to deliver enhanced emissions, performance,
and durability for your vehicle. The manufacturer recom-
mends the use of gasoline that meets the WWFC speci-
fications if they are available.
Reformulated Gasoline
Many areas of the country require the use of cleaner
burning gasoline referred to as Reformulated Gasoline.
Reformulated gasoline contains oxygenates, and is spe-
cifically blended to reduce vehicle emissions and im-
prove air quality.
The manufacturer strongly supports the use of reformu-
lated gasoline. Properly blended reformulated gasoline
will provide excellent performance and durability for the
engine and fuel system components.
Gasoline/Oxygenate Blends
Some fuel suppliers blend unleaded gasoline with oxy-
genates such as 10% ethanol, MTBE, and ETBE. Oxygen-
ates are required in some areas of the country during thewinter months to reduce carbon monoxide emissions.
Fuels blended with these oxygenates may be used in
your vehicle.
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.
198 STARTING AND OPERATING

RECOMMENDED FLUIDS, LUBRICANTS AND GENUINE PARTS
Engine
Component Fluid, Lubricant, or Genuine Part
Engine Coolant MopartAntifreeze/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. Refer to
oil viscosity chart for correct SAE grade meeting 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) MopartOil Filter (P/N 4105409)
Oil Filter (4.0L Engine) MopartOil Filter (P/N 05281090)
Fuel Selection 87 Octane
MAINTAINING YOUR VEHICLE 259
7

Power Steering....................... 236
Fog Lights............................. 58
Folding Rear Seat....................... 52
Folding Windshield..................... 102
Four Wheel Drive...................... 170
Shifting............................ 171
Four Wheel Drive Operation.............. 170
Front Axle............................ 248
Fuel................................. 197
Filler Cap........................... 200
Filter.............................. 234
Gasoline............................ 197
Gauge............................. 120
Materials Added...................... 199
Octane Rating........................ 197
Requirements........................ 258
Tank Capacity........................ 258
Fuel System Caution.................... 200
Fuses................................ 254
GasCap .............................. 200
Gasoline............................. 197
Gasoline, Reformulated.................. 198Gasoline/Oxygenate Blends............... 198
Gauges
Coolant Temperature................... 118
Fuel............................... 120
Odometer........................... 119
Oil Pressure......................... 117
Speedometer......................... 117
Tachometer.......................... 116
Voltmeter........................... 116
Gear Ranges........................164,166
Glass Cleaning......................... 252
Glove Compartment..................... 65
HardTop .............................. 78
Hard Top Removal...................... 79
Hazard Warning Flasher.................. 210
Headlights
Dimmer Switch....................... 57
Switch.............................. 57
Heater............................... 150
Heater, Engine Block.................... 162
High Beam Indicator.................... 117
Holder, Cup........................... 64
292 INDEX

Mopar Parts........................227,284
Multi-Function Control Lever............... 56
New Vehicle Break-In Period............... 39
Occupant Restraints...................... 16
Octane Rating, Gasoline.................. 197
Odometer............................. 119
Trip ............................... 119
Off-Pavement Driving................... 181
Off-Road Driving....................... 181
Oil, Engine........................... 228
Capacity............................ 258
Dipstick............................ 228
Filter.............................. 231
Identification Logo.................... 230
Materials Added to.................... 231
Recommendation..................230,258
Viscosity............................ 258
Onboard Diagnostic System............225,226
Outside Rearview Mirrors................. 49
Overheating, Engine..................... 210
Owner's Manual....................... 285Paint Care............................ 248
Paint Damage......................... 248
Parking Brake......................... 175
Passenger Airbag On/Off Switch............ 26
Passing Light........................... 57
PCV Valve............................ 234
Pets.................................. 39
Pets, Transporting....................... 39
Placard, Tire and Loading Information....... 188
Polishing and Waxing................... 249
Power
Distribution Center.................... 256
Steering............................ 236
Pregnant Women and Seat Belts............. 21
Preparation for Jacking................... 213
Pressure Gauge, Oil..................... 117
Radial Ply Tires........................ 193
Radio.......................122,130,135,140
Radio Broadcast Signals.................. 121
Radio Operation..................130,135,149
Radio, Satellite......................... 145
Rear Axle............................. 248
INDEX 295
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