2008 JEEP COMMANDER octane

using 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.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 ªReformulated Gasoline.º
Reformulated gasoline contains oxygenates, and are spe-
cifically blended to reduce vehicle emissions and im-
prove air quality.
The manufacturer supports the use of reformulated gaso-
line. Properly blended reformulated gasoline will pro-
vide excellent performance and durability of engine and
fuel system components.
334 STARTING AND OPERATING

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 gasoline 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
blends are not the responsibility of the manufacturer.
While MTBE is an oxygenate made from Methanol, it
does not have the negative effects of Methanol.
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 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.
STARTING AND OPERATING 335
5

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:
²The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance,
damage the emission control system.
²An 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.
²The 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.
336 STARTING AND OPERATING

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
²you do not switch when the fuel gauge indicates less
than 1/4 full
²you do not add less than 5 gallons when refueling
²you 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.
NOTE:When the ambient temperature is above 90ÉF
(32ÉC), you may experience hard starting and rough idle
following start up even if the above recommendations are
followed.
STARTING AND OPERATING 339
5

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 (3.7L/4.7L/5.7L En-
gines)Use API Certified SAE 5W-20 Engine Oil, meeting the requirements of
DaimlerChrysler Material Standard MS-6395. Refer to your engine oil filler
cap for correct SAE grade.
Oil Filter (All Engines) MopartOil Filter (P/N 05281090)
Spark Plugs (3.7L Engine) ZFR6F-11G (Gap 0.043º)
Spark Plugs (4.7L Engine) Upper Bank Ð FR8TE2 (Gap 0.040º) Lower Bank Ð FR8T1332 (Gap 0.050º)
Spark Plugs (5.7L Engine) REC14MCC4 (Gap 0.043º)
Fuel Selection (3.7L and 4.7L En-
gines)87 Octane
Fuel Selection (5.7L Engines) 87 Octane Acceptable - 89 Octane Recommended
436 MAINTAINING YOUR VEHICLE

Folding Rear Seat..................... 113,117
Four Wheel Drive....................... 290
Operation........................... 290
Systems............................. 290
Four Wheel Drive Operation................ 290
Four-Way Hazard Flasher.................. 366
Freeing A Stuck Vehicle................... 289
Front Axle (Differential)................... 410
Front Heated Seats....................... 111
Fuel................................. 333
Filler Cap (Gas Cap).................... 341
Gasoline............................ 333
Gauge.............................. 194
Hoses.............................. 407
Materials Added....................... 336
Octane Rating......................333,334
Requirements......................... 435
System Hoses......................... 407
Tank Capacity........................ 435Fuel, Flexible.............See Flexible Fuel Vehicles
Fuel System Caution................336,342,343
Fuses................................ 419
Garage Door Opener (HomeLinkt) ........... 159
Gas Cap (Fuel Filler Cap)............341,343,386
Gasoline (Fuel)......................... 333
Gasoline, Reformulated................... 334
Gasoline/Oxygenate Blends................ 335
Gauges
Coolant Temperature.................... 191
Fuel................................ 194
Speedometer......................... 187
Tachometer.......................... 189
Gear Ranges........................... 283
General Information...............20,26,108,333
Glass Cleaning.......................... 418
Gross Axle Weight Rating.................. 347
Gross Vehicle Weight Rating................ 346
464 INDEX

Modifications/Alterations, Vehicle............. 9
Monitor, Tire Pressure System............... 323
Mopar Parts.........................388,451
MP3 Player............................ 239
Multi-Displacement Engine System........... 306
Multi-Function Control Lever............... 124
Navigation Radio........................ 242
Navigation System....................... 242
New Vehicle Break-In Period................ 69
Occupant Restraints....................... 38
Octane Rating, Gasoline (Fuel)............333,334
Odometer..........................192,193
Trip ................................ 192
Off-Pavement Driving (Off-Road)..........296,414
Off-Road Driving (Off-Pavement)..........296,414
Oil Change Indicator..................... 200
Oil Change Indicator, Reset................. 200Oil, Engine............................ 389
Capacity............................ 435
Change Interval....................... 390
Dipstick............................. 389
Disposal............................ 391
Filter............................... 391
Filter Disposal........................ 391
Identification Logo..................... 390
Materials Added to..................... 391
Pressure Warning Light.................. 189
Recommendation...................390,435
Synthetic............................ 391
Viscosity..........................390,435
Onboard Diagnostic System..............385,386
Opener, Garage Door (HomeLinkt) ........... 159
Outside Rearview Mirrors.................. 79
Overdrive............................. 286
Overdrive OFF Switch.................... 286
Overhead Console....................... 158
INDEX 469
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