2008 JEEP WRANGLER oil viscosity

ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine in
your vehicle.
Drive moderately during the first 300 mi (500 km). After
the initial 60 mi (100 km), speeds up to 50 or 55 mph (80
or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration, within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detri-
mental and should be avoided.
The engine oil installed in the engine at the factory is a
high-quality energy-conserving type lubricant. Oil
changes should be consistent with anticipated climate
conditions under which vehicle operations will occur. For
the recommended viscosity and quality grades, refer to
“Maintenance Procedures” in Section 7 of this manual.
NON-DETERGENT OR STRAIGHT MINERAL OILS
MUST NEVER BE USED.A new engine may consume some oil during its first few
thousand miles (kilometers) of operation. This should be
considered as a normal part of the break-in and not
interpreted as an indication of difficulty.
SAFETY TIPS
Exhaust Gas
WARNING!
Exhaust gases can injure or kill. They contain carbon
monoxide (CO) which is colorless and odorless.
Breathing it can make you unconscious and can
eventually poison you. To avoid breathing (CO)
follow the safety tips below.
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 75
2

CAUTION!
Overfilling or underfilling the crankcase will cause
aeration or loss of oil pressure. This could damage
your engine.
Change Engine Oil
Refer to the Maintenance Schedule in Section 8 for
recommended engine oil change intervals.
Engine Oil Selection
For best performance and maximum protection for all
engines under all types of operating conditions, the
manufacturer recommends engine oils that are API Cer-
tified and meet the requirements of DaimlerChrysler
Material Standard MS-6395.
American Petroleum Institute (API) Engine Oil
Identification Symbol
This symbol means that the oil has
been certified by the American
Petroleum Institute (API). The
manufacturer only recommends
API Certified engine oils.
Engine Oil Viscosity (3.8L Engines)
SAE 5W-20 engine oil is recommended for all operating
temperatures. This engine oil improves low temperature
starting and vehicle fuel economy.
The engine oil filler cap also shows the recommended
engine oil viscosity for your engine. For information on
engine oil filler cap location, refer to the “Engine Com-
partment” illustration in this section.
384 MAINTAINING YOUR VEHICLE

Lubricants which do not have both, the engine oil certi-
fication mark and the correct SAE viscosity grade num-
ber, should not be used.
Synthetic Engine Oils
Synthetic engine oils can be used if the recommended oil
quality requirements are met, and the recommended
maintenance intervals for oil and filter changes are
followed.
Materials Added To Engine Oils
The manufacturerstrongly recommends against the ad-
dition of any additives (other than leak detection dyes) to
engine oil. Engine oil is an engineered product and its
performance may be impaired by supplemental addi-
tives.
Disposing of Used Engine Oil
Care should be taken in disposing of used engine oil from
your vehicle. Used oil, indiscriminately discarded, can
present a problem to the environment. Contact your authorized dealer, service station, or governmental
agency for advice on how and where used oil can be
safely discarded in your area.
Engine Oil Filter
The engine oil filter should be replaced at every engine
oil change.
Engine Oil Filter Selection
All of the manufacturer’s engines have a full-flow type
disposable oil filter. Use a filter of this type for replace-
ment. The quality of replacement filters varies consider-
ably. Only high quality filters should be used to assure
most efficient service. MOPAR
engine oil filters are high
quality oil filters and are recommended.
MAINTAINING YOUR VEHICLE 385
7

Jacking............................. 366
Jump Starting ......................... 371
Tow Hooks .......................... 374
Emission Control System Maintenance ......380,428
Engine ................................ 75
Air Cleaner .......................... 389
Block Heater ......................... 275
Break-In Recommendations ................ 75
Compartment ......................... 378
Compartment Identification ............... 378
Exhaust Gas Caution .................. 75,339
Fails to Start .......................... 273
Flooded, Starting ...................... 273
Fuel Requirements .................. 336,424
Jump Starting ......................... 371
Oil .............................. 383,424
Oil Disposal .......................... 385
Oil Filter ............................ 385
Oil Selection .......................... 424 Operation
............................ 75
Overheating .......................... 365
Starting ............................. 271
Temperature Gauge ..................... 209
Engine Oil Viscosity ...................... 384
Engine Oil Viscosity Chart ................. 384
Enhanced Accident Response Feature .......... 59
Entry System, Illuminated .................. 19
Event Data Recorder ...................... 60
Exhaust Gas Caution ................... 75,339
Exhaust System ......................... 393
Extender, Seat Belt ........................ 50
Exterior Finish Care ...................... 407
Fabric Care ......................... 409,411
Fabric Top ............................. 411
Filters Air Cleaner .......................... 389
Engine Fuel .......................... 388
450 INDEX

Trip .............................210,211
Off-Pavement Driving (Off-Road) ............ 294
Off-Road Driving (Off-Pavement) ............ 294
Oil Change Indicator ..................... 212
Oil Change Indicator, Reset ................. 212
Oil, Engine ............................ 383
Capacity ............................ 424
Dipstick ............................. 383
Filter ............................... 385
Identification Logo ..................... 384
Materials Added to ..................... 385
Pressure Warning Light .................. 207
Recommendation ................... 384,424
Viscosity .......................... 384,424
Oil Pressure Light ....................... 207
Onboard Diagnostic System ..............379,380
Outside Rearview Mirrors .................. 84
Overheating, Engine ...................... 365
Owner’s Manual (Operator Manual) .......... 441Paint Care
............................. 406
Paint Damage .......................... 406
Panic Alarm ............................ 21
Parking Brake .......................... 308
Passing Light ........................... 99
PCV Valve ............................ 388
Pets .................................. 74
Phone, Cellular .................... 85,250,251
Phone, Hands-Free (UConnect™) ........85,250,251
Placard, Tire and Loading Information ......... 318
Polishing and Waxing ..................... 407
Port Universal Serial Bus (USB) ................ 250
USB ................................ 250
Power Distribution Center (Fuses) ............... 413
Door Locks ........................... 33
Steering .......................... 31 1,391
Windows ............................. 36
456 INDEX

Trip Computer.......................... 215
Trip Odometer .......................... 211
Trip Odometer Reset Button ................ 210
Turn Signals .................... 99,207,421,422
UConnect™ (Hands-Free Phone) ...........85,250
Uniform Tire Quality Grades ................ 442
Universal Serial Bus (USB) Port .............. 250
Upholstery Care ........................ 409
USB Port .............................. 250
Vacuum/Vapor Harnesses ................. 399
Vehicle Certification Label ................. 342
Vehicle Identification Number (VIN) ............ 8
Vehicle Loading ...................... 318,342
Vehicle Modifications/Alterations .............. 8
Vehicle Storage ....................... 266,419
Viscosity, Engine Oil ...................... 384 Warning Flasher, Hazard
.................. 364
Warning Lights
(Instrument Cluster Description) ............. 206
Warning, Roll Over ........................ 5
Warnings and Cautions ..................... 8
Warranty Information ..................... 440
Washer, Adding Fluid ..................... 198
Washers, Windshield ..................... 393
Waxing and Polishing ..................... 407
Wheel Alignment and Balance ............... 328
Wheel and Wheel Trim .................... 409
Wheel and Wheel Trim Care ................ 409
Wheel Mounting ........................ 370
Wind Buffeting .......................... 38
Window Fogging ........................ 265
Windows .............................. 36
Power ............................... 36
Windshield, Folding ...................... 191
462 INDEX