²Driving in dusty conditions.
²Frequent trailer towing.
²Taxi, police, or delivery service (commercial service).
²Off-road or desert operation.
²Extensive operation at high engine speeds (greater
than 2900 rpm) and loads (greater than 70% throttle).
IfANYof these apply to you, then change your engine oil
at every interval shown in schedule9B9of the9Mainte-
nance Schedules9section of this manual.
If none of these apply to you, then change your engine oil
at every interval shown on schedule9A9of the9Mainte-
nance Schedules9section of this manual.
NOTE:Most vehicles are operated under the conditions
listed for Schedule9B.9
Engine Oil Selection
1. Engine Oil Quality
Use only oils conforming to API
Service CI-4. A sulfated ash limit
is specified for lubrication oil used
in Cummins engines. Oils with a
high ash content may produce de-
posits on valves that can progress
to guttering and valve burning. A
maximum sulfated ash content of
1.85 mass % is recommended for
all oil used in the engine.
2. Engine Oil Viscosity (SAE Grade)
The proper SAE viscosity of engine oil for the expected
ambient temperature range should be selected, as indi-
cated in the following chart:
MAINTAINING YOUR VEHICLE 327
7
Trailer Towing......................79,279
Modifications/Alterations, Vehicle............. 7
Mopar Parts.........................322,407
Multi-Function Control Lever............... 103
New Vehicle Break-In Period................ 67
Noise Control
Maintenance.......................... 357
Tampering Prohibited................... 358
Noise Emission Warranty...............357,359
Occupant Restraints....................... 33
Odometer..........................148,149
Trip .............................148,149
Off-Pavement Driving.................... 292
Off-Road Driving........................ 292
Oil, Engine............................ 380
Capacity............................ 379
Change Interval....................... 326Dipstick............................. 325
Disposal............................ 331
Filter.........................325,328,380
Pressure Gauge....................... 145
Recommendation...................... 327
Viscosity............................ 327
Oil Filter, Change........................ 328
Onboard Diagnostic System................ 321
Opener, Garage Door..................... 120
Operating Precautions.................... 321
Outside Rearview Mirrors.................. 76
Overdrive............................. 220
Overdrive OFF Switch.................... 220
Overhead Console.................... 112,113
Overhead Travel Information Center.......... 113
Owner's Manual........................ 408
Parking Brake.......................... 238
Passenger Airbag On/Off Switch............. 50
420 INDEX
