2007 JEEP GRAND CHEROKEE octane

5.7L Engines (If Equipped)
The 5.7L engine is designed to meet all
emissions regulations and provide satisfac-
tory fuel economy and performance when
using high quality unleaded gasoline hav-
ing an octane range of 87 to 89. The manu-
facturer 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 gasolines, 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.
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 gasolines contain oxygenates, and are spe-
cifically blended to reduce vehicle emissions and im-
prove air quality.
306 STARTING AND OPERATING

The manufacturer supports the use of reformulated gaso-
lines. Properly blended reformulated gasolines will pro-
vide excellent performance and durability of 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 the
winter months to reduce carbon monoxide emissions.
Fuels blended with these oxygenates may be used in
your vehicle.
CAUTION!
DO NOT use gasolines containing Methanol or E85
Ethanol. Use of these blends may result in starting
and driveability problems and may damage critical
fuel system components.
Problems that result from using methanol/gasoline or
E85 Ethanol blends are not the responsibility of the
manufacturer. While MTBE is an oxygenate made from
Methanol, it does not have the negative effects of Metha-
nol.
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.
STARTING AND OPERATING 307
5

It is even more important to look for gasolines without
MMT in Canada, because MMT can be used at levels
higher than those allowed in the United States.
MMT is prohibited in Federal and California reformu-
lated 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 and would result in additional cost. Therefore
you should not have to add anything to the fuel.
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.
•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.
308 STARTING AND OPERATING

CAUTION!
Only vehicles with the E-85 fuel filler door label can
operate on E-85.
ETHANOL FUEL (E-85)
E-85 is a mixture of approximately 85% fuel ethanol and
15% unleaded gasoline.
WARNING!
Ethanol vapors are extremely flammable and could
cause serious personal injury. Never have any smok-
ing materials lit in or near the vehicle when remov-
ing the fuel filler tube cap (gas cap) or filling the
tank. Do not use E-85 as a cleaning agent and never
use it near an open flame.
Fuel Requirements
Your vehicle will operate on both unleaded gasoline with
an octane rating of 87, or E-85 fuel, or any mixture of
these two.
For best results, a refueling pattern that alternates be-
tween E-85 and unleaded gasoline should be avoided.
When you do switch fuels, it is recommended that
•you do not switch when the fuel gauge indicates less
than 1/4 full
•you do not add less than 5 gallons when refueling
•you operate the vehicle immediately after refueling for
a period of at least 5 minutes
Observing these precautions will avoid possible hard
starting and/or significant deterioration in drivability
during warm up.
310 STARTING AND OPERATING

FLUIDS, LUBRICANTS, AND GENUINE PARTS
Engine
Component Fluid, Lubricant, or Genuine Part
Engine Coolant MoparAntifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid
Organic Additive Technology)
Engine Oil (3.7L/4.7L/5.7L Engines) Use API Certified SAE 5W-20 Engine Oil, meeting the requirements of
DaimlerChrysler Material Standard MS-6395.
Engine Oil (3.0L Diesel Engines) Use API Certified SAE 5W-30 Synthetic Engine Oil, meeting the require-
ments of DaimlerChrysler Material Standard MS-11106 or Mercedes Benz
MB 229.51 and ACEA C3 qualified engine oils.
Oil Filter (3.7/4.7/5.7L Gasoline Engines) MoparOil Filter (P/N 05281090)
Oil Filter (3.0L Diesel Engines) MoparOil Filter (P/N 05175571AA)
Spark Plugs Refer to the Vehicle Emission Control Information label in the engine
compartment.
Fuel Selection (3.7L and 4.7L Engines) 87 Octane
Fuel Selection (5.7L Engines) 87 Octane Acceptable - 89 Octane Recommended
Fuel Selection (3.0L Diesel Engines) Use only the best quality fuel with a calculated Cetane Index of 50 or
higher. In addition, the manufacturer recommends using diesel fuel with a
sulfur content ofless than 350 ppm.
408 MAINTAINING YOUR VEHICLE

Gauge.............................. 181
Hoses.............................. 382
Materials Added....................... 308
Octane Rating......................305,306
Requirements......................312,407
System Hoses......................... 382
Tank Capacity........................ 407
Fuel, Flexible.............See Flexible Fuel Vehicles
Fuel System Caution................308,314,315
Fuses................................ 393
Garage Door Opener (HomeLink) ........... 146
Gas Cap (Fuel Filler Cap)............313,315,358
Gasoline (Fuel)......................... 305
Gasoline, Reformulated................... 306
Gasoline/Oxygenate Blends................ 307
Gauges
Coolant Temperature.................... 179
Fuel................................ 181Speedometer......................... 175
Tachometer.......................... 177
Gear Ranges........................... 255
General Information.................... 23,305
Glass Cleaning.......................... 392
GlowPlugLight ........................ 182
GrossAxleWeightRating .................. 319
Gross Vehicle Weight Rating................ 318
GVWR ............................... 316
Hands-Free Phone (UConnect™).............. 77
Hazard Warning Flasher................... 338
Head Restraints......................... 102
Head Rests............................ 102
Headlights............................ 114
Bulb Replacement...................... 402
Cleaning............................ 392
On With Wipers....................... 114
Replacing............................ 402
458 INDEX

New Vehicle Break-In Period................ 64
Occupant Restraints....................... 34
Octane Rating, Gasoline (Fuel)............305,306
Odometer..........................180,181
Trip ................................ 180
Off-Pavement Driving (Off-Road)..........268,388
Off-Road Driving (Off-Pavement)..........268,388
Oil, Engine............................ 362
Capacity............................ 407
Change Interval....................... 363
Dipstick............................. 362
Disposal............................ 365
Filter ............................... 366
Filter Disposal........................ 365
Identification Logo..................... 364
Materials Added to..................... 365
Pressure Warning Light.................. 177
Recommendation.................363,364,407Synthetic............................ 365
Viscosity.......................364,365,407
Onboard Diagnostic System..............358,359
Opener, Garage Door (HomeLink) ........... 146
Outside Rearview Mirrors.................. 73
Overdrive............................. 258
Overdrive OFF Switch.................... 258
Overhead Console....................... 145
Overheating, Engine...................179,338
Owner’s Manual (Operator Manual).......... 448
PaintCare ............................. 389
Paint Damage.......................... 389
Panic Alarm............................ 22
Park Assist System, Rear.................. 138
Parking Brake.......................... 272
Passing Light........................... 118
Pedals, Adjustable....................... 124
Pets.................................. 64
INDEX 463
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