2005 JEEP GRAND CHEROKEE octane

FUEL REQUIREMENTS
3.7/4.7L Engines (If Equipped)
All engines (except 5.7L engines) are de-
signed to meet all emissions regulations
and provide excellent fuel economy and
performance when using high quality un-
leaded “regular” gasoline having an oc-
tane rating of 87. The use of premium
gasoline is not recommended. Under normal conditions,
the use of premium gasoline will not provide a benefit
over high quality regular gasolines, and in some circum-
stances may result in poorer performance.
5.7L Engines (If Equipped)
The 5.7L engine is designed to meet all
emissions regulations and provide satisfac-
tory fuel economy and performance whenusing high quality unleaded gasoline having an octane
range of 87 to 89. The manufacturer recommends the use
of 89 octane for optimum performance. The use of
premium gasoline is not recommended. Under normal
conditions, the use of premium gasoline will not provide
a benefit over high quality regular and mid-grade gaso-
lines, 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.
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 277
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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:
•The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance,
damage the emission control system.
STARTING AND OPERATING 279
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•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.
280 STARTING AND OPERATING

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 (3.7L/4.7L Engines) Use API Certified SAE 5W-30 Engine Oil, meeting the requirements of
DaimlerChrysler Material Standard MS-6395.
Engine Oil (5.7L Engines) Use API Certified SAE 5W-20 Engine Oil, meeting the requirements of
DaimlerChrysler Material Standard MS-6395.
Oil Filter (All Engines) MoparOil Filter (P/N 05281090)
Spark Plugs Refer to the Vehicle Emission Control Information label in the engine com-
partment.
Fuel Selection (3.7L and 4.7L En-
gines)87 Octane
Fuel Selection (5.7L Engines) 87 Octane Acceptable - 89 Octane Recommended
358 MAINTAINING YOUR VEHICLE

Flooded Engine Starting................... 231
Fluid Capacities......................... 357
Fluid Leaks............................. 66
Fluid Level Checks
Automatic Transmission...............336,337
Engine Oil........................... 316
Power Steering........................ 326
Fog Light Service........................ 354
Fog Lights....................... 116,170,354
Folding Rear Seat........................ 103
Four Wheel Drive....................... 239
Operation........................... 239
Systems............................. 239
Four Wheel Drive Operation................ 239
Four-Way Hazard Flasher.................. 296
Freeing A Stuck Vehicle................... 238
Front Axle............................. 340
Fuel................................. 277
Filler Cap............................ 281Filler Door........................... 281
Filter............................... 323
Gasoline............................ 277
Gauge.............................. 169
Materials Added....................... 279
Octane Rating........................ 277
Requirements......................... 357
Tank Capacity........................ 357
Fuel System Caution...................279,282
Fuses................................ 345
Garage Door Opener..................... 138
GasCap ...........................281,313
Gasoline.............................. 277
Gasoline, Reformulated................... 278
Gasoline/Oxygenate Blends................ 278
Gauges
Coolant Temperature.................... 167
Fuel................................ 169
INDEX 397
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Lower Anchors and Tether for CHildren
(LATCH)...........................58,59
Lubrication, Body....................... 327
Luggage Rack.......................... 157
Lumbar Support........................ 101
Maintenance Free Battery.................. 324
Maintenance Procedures................... 316
Maintenance Schedule.................... 362
ScheduleA......................... 376
ScheduleB.......................... 365
Maintenance Schedules.................... 362
Malfunction Indicator Light..............164,314
Manual, Service......................... 389
Master Cylinder......................... 335
Memory Seat.........................75,106
Memory Seats and Radio.................. 106
Mini-Trip Computer...................... 180
Mirrors................................ 72Automatic Dimming..................... 73
Electric Powered....................... 75
Electric Remote........................ 75
Exterior Folding........................ 74
Heated.............................. 74
Outside.............................. 74
Rearview............................. 72
Vanity............................... 76
Modifications/Alterations, Vehicle............. 8
Monitor, Tire Pressure System............... 269
Mopar Parts.........................315,388
Multi-Displacement Engine System........... 254
Multi-Function Control Lever............... 112
New Vehicle Break-In Period................ 63
Occupant Restraints....................... 27
Octane Rating, Gasoline................... 277
Odometer............................. 168
INDEX 401
10