SERVICING AND MAINTENANCE 359Heavy Duty Use Of The VehicleChange engine oil at 4,000 miles (6,500 km) or350 hours of engine run time if the vehicle isoperated in a dusty and off road environment oris operated predominately at idle or only verylow engine RPM. This type of vehicle use isconsidered Severe Duty.SCHEDULED SERVICING — DIESEL ENGINEYour vehicle is equipped with an automatic oilchange indicator system. The oil changeindicator system will remind you that it is time totake your vehicle in for scheduled maintenance.Based on engine operation conditions, the oilchange indicator message will illuminate. Thismeans that service is required for your vehicle.Operating conditions such as frequentshort-trips, trailer tow, extremely hot or coldambient temperatures will influence when the“Oil Change Required” message is displayed.Severe Operating Conditions will cause thechange oil message to illuminate morefrequently. Have your vehicle serviced as soonas possible, within the next 500 miles(805 km).An authorized dealer will reset the oil changeindicator message after completing thescheduled oil change. If a scheduled oil changeis performed by someone other than anauthorized dealer, the message can be reset byreferring to the steps described under“Instrument Cluster Display” in “Getting ToKnow Your Instrument Panel” for furtherinformation.NOTE:Under no circumstances should oil changeintervals exceed 10,000 miles (16,000 km) or12 months, whichever comes first.Once A Month Or Before A Long Trip: Check engine oil level Check windshield washer fluid level Check the tire inflation pressures and lookfor unusual wear or damage Check the fluid levels of the coolant reservoir,brake master cylinder, and power steering,and fill as needed Check function of all interior and exteriorlightsWARNING! You can be badly injured working on oraround a motor vehicle. Do only servicework for which you have the knowledge andthe right equipment. If you have any doubtabout your ability to perform a service job,take your vehicle to a competent mechanic. Failure to properly inspect and maintainyour vehicle could result in a componentmalfunction and effect vehicle handlingand performance. This could cause an acci-dent.7
