2015 JEEP GRAND CHEROKEE octane

FUEL REQUIREMENTS
6.4L Engine
This engine is designed to meet all emis-
sions regulations and provide improved
fuel economy and performance when us-
ing high-quality premium unleaded gaso-
line with an octane rating of 91 or higher.
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. Engine damage resulting
from operating from operating with heavy spark knock
may void or not be covered by the new vehicle warranty.
Reformulated Gasoline
Many areas of the country require the use of cleaner
burning gasoline referred to as “Reformulated Gasoline”.
Reformulated gasoline contain oxygenates and are spe-
cifically blended to reduce vehicle emissions and im-
prove air quality.
The use of reformulated gasoline is recommended. Prop-
erly blended reformulated gasoline will provide im-
proved performance and durability of engine and fuel
system components.
Gasoline/Oxygenate Blends
Some fuel suppliers blend unleaded gasoline with oxy-
genates such as ethanol.
5
STARTING AND OPERATING 471

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 emissions 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
the gasoline contains MMT. 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 is not needed under normal
conditions and they 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 gasoline is prohibited by Federal
law. Using leaded gasoline can impair engine per-
formance and damage the emissions control sys-
tem.
•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 ser-
vice. Contact your authorized dealer for service
assistance.
(Continued)
5
STARTING AND OPERATING 473

CAUTION!(Continued)
•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 perfor-
mance problems resulting from the use of such
fuels or additives is not the responsibility of the
manufacturer and may void or not be covered
under the New Vehicle Limited Warranty.
NOTE:Intentional tampering with the emissions control
system 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.
•Guard against carbon monoxide with proper main-
tenance. Have the exhaust system inspected every
(Continued)
474 STARTING AND OPERATING

FLUIDS, LUBRICANTS, AND GENUINE PARTS
Engine
Component Fluid, Lubricant or Genuine Part
Engine Coolant We recommend you use MOPAR® Antifreeze/Coolant 10 Year/150,000
Mile Formula OAT (Organic Additive Technology) that meets the require-
ments of FCA Material Standard MS.90032.
Engine Oil For best performance and maximum protection under all types of operating
conditions, the manufacturer only recommends full synthetic engine oils
that meet the American Petroleum Institute (API) categories of SN.
The manufacturer recommends the use of Pennzoil Ultra™ 0W-40 or
equivalent MOPAR® engine oil meeting the requirements of FCA US
Material Standard MS-12633 for use in all operating temperatures.
Engine Oil Filter We recommend you use MOPAR® Engine Oil Filters.
Spark Plugs We recommend you use MOPAR® Spark Plugs.
Fuel Selection Premium Unleaded 91 Octane Only or Higher.
592 MAINTAINING YOUR VEHICLE

Fluids, Lubricants And Genuine Parts...........592
Fog Lights...........................286, 587
Fog Light Service.........................587
Folding Rear Seat.........................156
Forward Collision Warning..................214
Four-Way Hazard Flasher...................500
Freeing A Stuck Vehicle.....................519
Front Axle (Differential).....................564
Fuel...................................471
Adding..............................475
Additives.............................473
Clean Air.............................471
Economy Mode........................405
Ethanol..............................471
Gasoline..............................471
Gauge...............................286
Materials Added........................473
Methanol.............................471
Octane Rating......................471, 592Requirements.......................471, 591
Tank Capacity..........................591
Fueling................................475
Fuses..................................574
Garage Door Opener (HomeLink®).........242, 249
Gasoline, Clean Air........................471
Gasoline (Fuel)...........................471
Gasoline, Reformulated.....................471
Gauges
Coolant Temperature.....................286
Fuel.................................286
Speedometer..........................286
Tachometer............................286
Gear Ranges.............................409
General Information....................210, 470
Glass Cleaning
...........................572
Gross Axle Weight Rating...................482
Gross Vehicle Weight Rating..................481
620 INDEX

Maintenance Schedule...................596, 598
Malfunction Indicator Light (Check Engine) . . .286, 528
Manual, Service..........................610
Memory Feature (Memory Seat)...............158
Memory Seat............................158
Memory Seats And Radio...................158
Methanol...............................471
Mirrors................................121
Electric Powered........................129
Electric Remote.........................129
Exterior Folding........................128
Heated...............................130
Outside..............................128
Rearview.............................121
Vanity...............................131
Modifications/Alterations, Vehicle...............9
Monitor, Tire Pressure System................463
MOPAR® Parts.......................530, 609
MTBE/ETBE............................471Multi-Function Control Lever.................164
Occupant Restraints........................49
Octane Rating, Gasoline (Fuel)................471
Odometer...............................286
Trip .................................286
Oil, Engine.......................299, 532, 592
Capacity.............................591
Change Interval........................532
Checking.............................532
Disposal..............................534
Filter.............................535, 592
Filter Disposal.........................534
Identification Logo......................533
Materials Added To......................534
Recommendation....................533, 591
Synthetic.............................534
Viscosity......................
.533, 534, 591
Oil Filter, Change.........................535
624 INDEX