Scheduled Maintenance
7-7
Long Trip/Highway Definition
Follow this scheduled maintenance only if none of the
conditions from the Short Trip/City Scheduled
Maintenance are true. Do not use this schedule if the
vehicle is used for trailer towing, driven in a dusty area
or used off paved roads. Use the Short Trip/City
schedule for these conditions.
Driving a vehicle with a fully warmed engine under
highway conditions causes engine oil to break
down slower.
Long Trip/Highway Intervals
Every 7,500 Miles (12 500 km): Engine Oil and Filter
Change (or every 12 months, whichever occurs first).
Chassis Lubrication (or every 12 months, whichever
occurs first). Drive Axle Service. Tire Rotation.
Every 15,000 Miles (25 000 km): Gasoline Engine
Only: Shields and Underhood Insulation Inspection
(GVWR above 10,000 lbs. only). Diesel Engine Only:
Shields and Underhood Insulation Inspection.
Diesel Engine Only: Thermostatically Controlled
Engine Cooling Fan Check (or every 12 months,
whichever occurs first). Diesel Engine Only: Air
Intake System Inspection.
Every 30,000 Miles (50 000 km): 3500 H.D.
Models: Drive Axle Fluid Change with High Speed
Use. Fuel Filter Replacement. Front Wheel Bearing
Repack (2WD only) (or at each brake relining,
whichever occurs first).
(Continued)
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