2012 JEEP WRANGLER octane

FUEL REQUIREMENTS
All engines are designed to meet all emis-
sions regulations and provide excellent
fuel economy and performance when us-
ing high quality unleaded “regular” gaso-
line having an octane rating of 87. 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 manufacturer’s 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.
Reformulated Gasoline
Many areas of the country require the use of cleaner
burning gasoline referred to as “Reformulated Gasoline.”
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 for the engine
and fuel system components.
460 STARTING AND OPERATING

•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 the octane num-
ber. Gasoline blended with MMT offers no performance
advantage beyond gasoline of the same octane number
without MMT. Gasoline blended with MMT has shown
to reduce sparkplug life and reduce emission system
performance in some vehicles. The manufacturer recom-
mends that gasoline without MMT be used in your
vehicle. The MMT content of gasoline may not be indi-
cated 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-
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 are not needed under
normal conditions and would result in additional cost.
Therefore you should not have to add anything to the
fuel.
462 STARTING AND OPERATING

Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle’s
performance:
•The use of leaded gasoline is prohibited by Fed-
eral law. Using leaded gasoline can impair engine
performance, and 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 authorized dealer for service
assistance.(Continued)
CAUTION! (Continued)
•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.
5
STARTING AND OPERATING 463

FLUIDS, LUBRICANTS AND GENUINE PARTS
Engine
ComponentFluid, Lubricant, or Genuine Part
Engine Coolant MOPARAntifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid
Organic Additive Technology) or equivalent.
Engine Oil Use API Certified SAE 5W-30 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 RER8ZWYCB4 (Gap 0.043 in [1.1 mm])
Fuel Selection 87 Octane
560 MAINTAINING YOUR VEHICLE

FiltersAir Cleaner ......................... 520
Air Conditioning .................. 365,523
Engine Oil ......................... 520
Finish Care ............................ 542
Flashers Hazard Warning ..................... 492
Turn Signal ................. 89,270,557,558
Flooded Engine Starting ................... 373
Fluid Capacities ......................... 559
Fluid Leaks ............................. 89
Fluid Level Checks ...................... 541
Automatic Transmission ................ 537
Engine Oil ......................... 518
Manual Transmission .................. 540
Power Steering ...................... 413
Fluids, Lubricants and Genuine Parts .......... 560
Fog Light Service ........................ 557
Fog Lights .......................... 152,557Fold and Tumble Rear Seat
................. 144
Folding Rear Seat ........................ 146
Folding Windshield ...................... 253
Four Wheel Drive ....................... 390
Shifting ........................... 392
Four Wheel Drive Operation ................ 390
Four-Way Hazard Flasher .................. 492
Freeing A Stuck Vehicle ................... 505
Front Axle (Differential) ................... 541
Fuel ................................. 460
Ethanol ........................... 461
Filler Cap (Gas Cap) .................. 465
Gasoline ........................... 460
Gauge ............................ 269
Materials Added ..................... 462
Methanol .......................... 461
Octane Rating ....................... 460
Requirements ....................... 559
Tank Capacity ....................... 559
10
INDEX 597

Methanol............................. 461
Mini-Trip Computer ................ 283,284,293
Mirrors ................................ 96
Electric Powered ...................... 98
Electric Remote ....................... 98
Outside ............................ 97
Rearview ........................... 96
Vanity ............................. 98
Modifications/Alterations, Vehicle ............. 9
Modular Hard Top ....................... 176
Monitor, Tire Pressure System ............... 454
Mopar Parts ......................... 516,586
MTBE/ETBE ........................... 461
Multi-Function Control Lever ............... 149
New Vehicle Break-In Period ................ 84
Occupant Restraints ....................... 43
Octane Rating, Gasoline (Fuel) .............. 460Odometer
.......................... 277,283
Trip ........................ 275,277,283
Off-Pavement Driving (Off-Road) ............ 399
Off-Road Driving (Off-Pavement) ............ 399
Oil Change Indicator .................. 279,292
Oil Change Indicator, Reset ..............279,292
Oil Pressure Light ....................... 270
Oil, Engine ............................ 518
Capacity ........................... 559
Change Interval ..................... 292
Dipstick ........................... 518
Filter ............................. 520
Identification Logo ................... 519
Materials Added to ................... 520
Pressure Warning Light ................ 270
Recommendation .................. 519,559
Viscosity ........................ 519,559
Onboard Diagnostic System ..............514,515
Operator Manual (Owner’s Manual) ............ 6
602 INDEX