The manufacturer provides maintenance schedules for each vehicle family based on "normal" operating conditions and schedules based on "severe service" conditions.
"Severe service" is considered to apply if the vehicle is operated under one or more of the following conditions:
Frequent, short-trip driving of less than 5 miles (8 km).
Frequent driving in dusty conditions.
Trailer towing or heavy load hauling.
Frequent, long periods of engine idling.
Sustained, high-speed operation.
Frequent starting or stopping.
Snow plow operation.
More than half of the vehicle operation occurs in heavy city traffic during hot weather (above 90ºF/32ºC).
Maintenance items for vehicles in "severe service" should be performed approximately twice as often as those in normal use.
In addition to the items listed in the charts, the following procedures should be carried out:
At each stop for fuel:
Check engine oil level.
Check windshield washer solvent.
Clean windshield and wiper blades.
After completion of off-road (4WD) use, the underside of the vehicle should be thoroughly inspected. Examine threaded fasteners for looseness.
Once a month:
Check tire pressure and look for unusual wear or damage.
Inspect battery and clean and tighten terminals as required.
Check fluid levels of coolant reservoir, brake master cylinder, power steering, and transmission.
Check lights and other electrical devices for proper operation.
At each oil change:
Inspect exhaust system.
Inspect brake hoses.
Adjust rear brakes.
Rotate the tires. If using "severe service" maintenance schedule, do this at every other oil change.
Check engine coolant level, hoses, clamps.
Lubricate steering linkage.
Lubricate the driveshaft universal joints and slip spline, if applicable.