octane JEEP GRAND CHEROKEE 2006 WK / 3.G Owners Manual

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.
302 STARTING AND OPERATING

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.
304 STARTING AND OPERATING

•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.
STARTING AND OPERATING 305
5

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
MAINTAINING YOUR VEHICLE 393
7

Fluid Capacities......................... 392
Fluid Leaks............................. 71
Fluid Level Checks
Automatic Transmission...............371,372
Engine Oil........................... 351
Power Steering........................ 360
Fluids, Lubricants and Genuine Parts.......... 393
Fog Light Service........................ 389
Fog Lights.......................125,186,389
Folding Rear Seat........................ 111
Four Wheel Drive....................... 262
Operation........................... 262
Systems............................. 262
Four Wheel Drive Operation................ 262
Four-Way Hazard Flasher.................. 328
Freeing A Stuck Vehicle................... 261
Front Axle (Differential)................... 375
Fuel................................. 302
Filler Cap (Gas Cap).................... 306Filler Door (Gas Cap)................... 306
Gasoline............................ 302
Gauge.............................. 186
Materials Added....................... 304
Octane Rating........................ 302
Requirements......................... 392
Tank Capacity........................ 392
Fuel System Caution...................304,307
Fuses................................ 380
Garage Door Opener (HomeLink) ........... 152
Gas Cap (Fuel Filler Cap)...............306,347
Gasoline (Fuel)......................... 302
Gasoline, Reformulated................... 303
Gasoline/Oxygenate Blends................ 303
Gauges
Coolant Temperature.................... 184
Fuel................................ 186
Speedometer......................... 180
INDEX 429
10

Rearview............................. 78
Vanity............................... 82
Modifications/Alterations, Vehicle............. 8
Monitor, Tire Pressure System............... 294
Mopar Parts.........................349,419
Multi-Displacement Engine System........... 278
Multi-Function Control Lever............... 121
New Vehicle Break-In Period................ 68
Occupant Restraints....................... 31
Octane Rating, Gasoline (Fuel).............. 302
Odometer..........................184,185
Trip ................................ 184
Off-Pavement Driving (Off-Road)..........274,375
Off-Road Driving (Off-Pavement)..........274,375
Oil, Engine............................ 351
Capacity............................ 392
Change Interval....................... 351Dipstick............................. 351
Filter............................... 354
Identification Logo..................... 353
Materials Added to..................... 354
Pressure Warning Light.................. 182
Recommendation...................352,392
Viscosity..........................353,392
Onboard Diagnostic System..............347,348
Opener, Garage Door (HomeLink) ........... 152
Outside Rearview Mirrors.................. 80
Overdrive............................. 257
Overdrive OFF Switch.................... 257
Overhead Console....................... 151
Overheating, Engine...................184,329
Owner’s Manual (Operator Manual).......... 420
Paint Care............................. 376
Paint Damage.......................... 376
Panic Alarm............................ 22
434 INDEX