2004 JEEP GRAND CHEROKEE octane

NOTE:The Tire Pressure Monitor system must be
retrained following a tire rotation. See your authorized
dealer for service.
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.
NOTE: 4.7L HO Engines (If Equipped): High quality
premium unleaded gasoline with an octane rating of 91
is recommended but not required.
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.
STARTING AND OPERATING 221
5

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.
Sulfur In Gasoline
If you live in the northeast United States, your vehicle
may have been designed to meet California low emission
standards with clean burning, low sulfur, California
gasoline. Gasoline sold outside of California is permitted
to have higher sulfur levels which may affect the perfor-
mance of the vehicle's catalytic converter. This may cause
the ªMalfunction Indicator Lightº to illuminate.
Illumination of this light while operating on high sulfur
gasoline does not necessarily mean your emission control
system is malfunctioning. The manufacturer recom-
mends that you try a different brand of unleaded gaso-
line having lower sulfur to determine if the problem is
fuel related prior to returning your vehicle to an autho-
rized dealer for service.
STARTING AND OPERATING 223
5

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 10W-30 Engine Oil is recommended for the 4.0L engine.
API Certified SAE 5W-30 Engine Oil is recommended for the 4.7L/4.7LHO
engine. Refer to oil viscosity chart for correct SAE grade meeting
DaimlerChrysler Material Standard MS-6395.
Oil Filter (All Engines) MopartOil Filter (P/N 05281090)
Spark Plugs Refer to the Vehicle Emission Control Information label in the engine com-
partment.
Fuel Selection 87 Octane (91 Octane is recommended but not required for the 4.7LHO)
292 MAINTAINING YOUR VEHICLE

Filters
Air Cleaner.......................... 264
Engine Fuel.......................... 263
Finish Care............................ 282
Flashers.............................. 236
Hazard Warning....................... 236
Turn Signal.......................... 129
Flat Tire Changing....................... 240
Flipper Glass, Tailgate..................... 15
Flooded Engine Starting................... 177
Fluid Capacities......................... 291
Fluid Leaks............................. 53
Fluid Level Checks
Automatic Transmission...............277,278
Engine Oil........................... 256
Power Steering........................ 266
Fog Lights............................. 79
Four Wheel Drive
Operation........................... 186Four-Way Hazard Flasher.................. 236
Freeing A Stuck Vehicle................... 186
Front Axle............................. 281
Fuel................................. 221
Filler Cap............................ 224
Filler Door........................... 224
Filter............................... 263
Gasoline............................ 221
Gauge.............................. 133
Light............................... 134
Materials Added....................... 224
Octane Rating........................ 221
Requirements......................... 291
Tank Capacity........................ 291
Fuel System Caution..................... 225
Fuses................................ 286
Garage Door Opener..................... 106
GasCap .............................. 224
INDEX 333
10

Lumbar Support......................... 67
Maintenance, Airbag...................... 43
Maintenance Free Battery.................. 264
Maintenance Procedures................... 256
Maintenance Schedule.................... 296
Schedule9A9......................... 310
Schedule9B9.......................... 299
Maintenance Schedules.................... 296
Maintenance, Sunroof..................... 114
Malfunction Indicator Light..............130,254
Manual, Service......................... 324
Map/Reading Lights....................75,89
Master Cylinder......................... 276
Memory Seat........................... 68
Memory Seats and Radio................... 68
Mini-Trip Computer...................... 103
Mirrors................................ 59
Automatic Dimming..................... 60Electric Powered....................... 61
Electric Remote........................ 61
Exterior Folding........................ 61
Heated.............................. 61
Outside.............................. 61
Rearview............................. 59
Vanity............................... 62
Modifications/Alterations, Vehicle............. 8
Monitor, Tire Pressure System.............92,217
Mopar Parts.........................255,323
Multi-Function Control Lever................ 76
Navigation System....................... 152
New Vehicle Break-In Period................ 51
Occupant Restraints....................... 26
Octane Rating, Gasoline................... 221
Odometer............................. 132
Trip ................................ 132
INDEX 337
10