2010 JEEP GRAND CHEROKEE octane

FUEL REQUIREMENTS
3.7 Engine
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, as it will not provide any
benefit over regular gasoline in these engines.
5.7L Engine
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, as it will not provide any benefit
over regular gasoline in these engines.
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 manufacturers worldwide 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.
5
STARTING AND OPERATING 315

•OBD II “Malfunction Indicator Light” on
•poor engine performance
•poor cold start and cold drivability
•increased risk for fuel system component corrosion
To fix a Non-FFV vehicle inadvertently fueled once with
E-85 perform the following:
•drain the fuel tank (see your authorized dealer)
•change the engine oil and oil filter
•disconnect and reconnect the battery to reset the
engine controller memory
More extensive repairs will be required for prolonged
exposure to E-85 fuel.
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 if the
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 those allowed in the United States.
MMT is prohibited in Federal and California reformu-
lated gasoline.
5
STARTING AND OPERATING 317

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 perfor-
mance and damage the emission control system.(Continued)
CAUTION! (Continued)
•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 authorized 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 concentra-
tions 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.
318 STARTING AND OPERATING

FLUIDS, LUBRICANTS, AND GENUINE PARTS
Engine
ComponentFluid, Lubricant, or Genuine Part
Engine Coolant MOPARAntifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hy-
brid Organic Additive Technology) or equivalent.
Engine Oil – 3.7L and 5.7L Engines Use API Certified SAE 5W-20 Engine Oil, meeting the requirements of Chrysler Material Standard MS-6395. Refer to your engine oil filler cap for
correct SAE grade.
Engine Oil Filter MOPAREngine Oil Filter or equivalent.
Spark Plugs – 3.7L Engine ZFR6F-11G (Gap 0.043 in [1.09 mm])
Spark Plugs – 5.7L Engine LZFR5C–11 (Gap 0.043 in [1.09 mm])
Fuel Selection – 3.7L Engine 87 Octane
Fuel Selection – 5.7L Engine 87 Octane Acceptable - 89 Octane Recommended
414 MAINTAINING YOUR VEHICLE

Front Axle (Differential)................... 387
Front Heated Seats ....................... 89
Fuel ................................. 315
Conserving .......................... 174
Filler Cap (Gas Cap) .................... 320
Gasoline ............................ 315
Gauge .............................. 167
Materials Added ....................... 318
Octane Rating ........................ 315
Requirements ......................... 413
Saver Mode .......................... 174
Tank Capacity ........................ 413
Fuel Optimizer ......................... 174
Fuel Saver ............................. 174
Fuel System Caution ................... 318,320
Fuses ................................ 398
Garage Door Opener (HomeLink) ........... 128
Gas Cap (Fuel Filler Cap) ............320,321,365Gasoline (Fuel)
......................... 315
Conserving .......................... 174
Gasoline, Reformulated ................... 316
Gasoline/Oxygenate Blends ................ 316
Gauges Coolant Temperature ................... 163
Fuel ............................... 167
Speedometer ......................... 158
Tachometer .......................... 161
Gear Ranges ........................... 245
General Information .................. 18,25,314
Glass Cleaning .......................... 397
Gross Axle Weight Rating ...............322,325
Gross Vehicle Weight Rating .............322,324
GVWR ............................... 322
Hands-Free Phone (uconnect™) .............. 84
Hazard Warning Flasher ................... 346
Head Restraints .......................... 88
452 INDEX

Multi-Function Control Lever............... 101
New Vehicle Break-In Period ................ 71
Occupant Restraints ................... 35,52,56
Occupant Restraints (Sedan) .............49,52,54
Octane Rating, Gasoline (Fuel) .............. 315
Odometer .......................... 164,166
Trip ................................ 164
Off-Pavement Driving (Off-Road) ..........259,392
Off-Road Driving (Off-Pavement) ..........259,392
Oil Change Indicator ..................... 172
Oil Change Indicator, Reset ................. 172
Oil, Engine ............................ 369
Capacity ............................ 413
Change Interval ....................... 370
Dipstick ............................. 369
Disposal ............................ 371
Filter ............................... 372 Filter Disposal
........................ 371
Identification Logo ..................... 370
Materials Added to ..................... 371
Recommendation ................... 370,413
Synthetic ............................ 371
Viscosity ......................... 371,413
Onboard Diagnostic System ..............365,366
Opener, Garage Door (HomeLink) ........... 128
Operator Manual (Owner’s Manual) ............ 6
Outside Rearview Mirrors .................. 81
Overdrive ............................. 248
Overdrive OFF Switch .................... 248
Overhead Console ....................... 127
Overheating, Engine ................... 164,346
Owner’s Manual (Operator Manual) .........6,441
Paint Care ............................. 393
Paint Damage .......................... 393
Panic Alarm ............................ 23
10
INDEX 457