Page 343 of 388

Long Trip/Highway Maintenance Schedule -- Gasoline Engines I
45,000 Miles (75 000 km)
0 Change engine oil and filter (or every 12 months, whichever occurs first).
0 Lubricate chassis components (or every 12 months, whichever occurs first).
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood
insulation for damage or looseness. Adjust or replace as required.
This is a
Noise Emission Control Service. Applicable only to vehicles sold in the
United States.
0 Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
rotation pattern and additional information. (See footnote
+.)
An Emission Control Service.
(See footnote #.)
50,000 Miles (83 000 km)
0 Change automatic transmission fluid and filter if the vehicle’s GVWR is
over
8600 lbs. or if the vehicle is mainly driven under one or more of
these conditions:
- In heavy city traffic where the outside temperature regularly reaches 90°F
- In hilly or mountainous terrain.
(32°C) or higher.
(Continued)
DATE I
MILEAGE
ACTUAL SERVICED BY
DATE
7-31
ProCarManuals.com
Page 345 of 388

Long Trir’Highway Maintenance Schedule . Gasoline Engines I
Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
0 Inspect engine accessory drive belt.
0 Replace fuel filter.
0 Replace air cleaner filter.
rotation pattern and
additional information. (See footnote
+.)
An Emission Control Service.
An Ernission Control Service.
(See footnote?.)
An Emission Control Service.
0 Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket
for
any damage. Replace parts as needed.
An Emission Control Service. (See footnote”f)
0 Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood
insulation for damage or looseness. Adjust or replace as required.
This is a
Noise Emission Control Service. Applicable only to vehicles sold in the
United States.
the service manual.
An Emission Control Service. (See footnote?.)
0 Conduct evaporative control system inspection. Check all fuel and vapor lines
and hoses for proper hook-up, routing and condition. Check that the purge
valve works properly,
if equipped. Replace as needed.
An Emission Control Service. (See footnote?.)
Conduct Exhaust Gas Recirculation (EGR) system inspection as described in
7-33
ProCarManuals.com
Page 346 of 388

Long Tripmighway Maintenance Schedule -- Gasoline Engines
67,SUU Miles (112 500 km)
Change engine oil and filter (or every 12 months, whichever occurs first).
0 Lubricate chassis components (or every 12 months, whichever occurs first),
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
rotation pattern and additional information. (See footnote
+.)
An Emission Control Service.
(See footnote #.)
75,000 Miles (125 000 km)
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
Lubricate chassis components (or every 12 months, whichever occurs first).
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Vehicles With GVWR Above 8,500 Ibs. Only: Inspect shields and underhood
insulation for damage or looseness. Adjust
or replace as required. This is a
Noise Emission Control
Ser :e. Applicable only to vehicles sold in the
United States.
0 Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
rotation pattern and additional information. (See footnote
+.)
(See footnote #.)
I DATE I
I DATE I
I MILEAGE ACTUAL I SERVICEDBY I
7-34
.. .
ProCarManuals.com
Page 347 of 388

Long Tripmighway Maintenance Schedule -- Gasoline Engines I
82,500 Miles (137 500 km)
0 Change engine oil and filter (or every 12 months, whichever occurs first).
0 Lubricate chassis components (or every 12 months, whichever occurs first).
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Rotate tires. See “Tire Inspection and Rotation’’ in the Index for proper
rotation pattern and additional information. (See footnote
+.)
MILEAGE An Emission Control Service.
(See footnote #.)
90,000 Miles (I50 000 km)
0 Change engine oil and filter (or every 12 months, whichever occurs first).
0 Lubricate chassis components (or every 12 months, whichever occurs first).
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Clean and repack the front wheel bearings (or at each brake relining,
0 Replace fuel filter.
0 Replace air cleaner filter.
An Emission Control Service.
(See footnote #.)
whichever occurs first).
An Emission Control Service. (See footnote?.)
An Emission Control Service.
(Continued)
I DATE I
7-35
ProCarManuals.com
Page 348 of 388

Long TrWHighway Maintenance Schedule -- Gasoline Engines I
90,000 Miles ;O 000 km) (Continued)
0 Vehicles With GVWR Above 8,500 lbs. Only: Inspect shields and underhood
insulation for damage or looseness. Adjust or replace as required.
This is a
Noise Emission Control Service. Applicable only to vehicles sold in the
United States.
0 Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
rotation pattern and additional information. (See footnote
+.)
97,500 Miles (162 500 km)
0 Change engine oil and filter (or every 12 months, whichever occurs first).
0 Lubricate chassis components (or every 12 months, whichever occurs first).
0 Check axle fluid level and add fluid as needed. (See footnote **.)
0 Rotate tires. See “Tire Inspection and Rotation” in the Index for proper
rotation pattern and additional information. (See
footnote +.)
An Emission Control Service.
(See footnote #.)
100,000 Miles (1 66 000 km)
Inspect spark plug wires.
0 Replace spark plugs.
An Emission Control Service.
An Emission Control Service.
~ ~
DATE I
7-36
ProCarManuals.com
Page 349 of 388

Long TripMighway Maintenance Schedule -I Gasoline Engines I
0 Change automatic transmission fluid and filter if the vehicle’s GVWR is
over
8600 lbs. or if the vehicle is mainly driven under one or more of
these conditions:
- In heavy city traffic where the outside temperature regularly reaches 90°F
- In hilly or mountainous terrain.
- When doing frequent trailer towing.
(32°C) or
higher.
- Uses such as found in taxi, police or delivery service.
previously and, therefore, haven’t changed your automatic transmission fluid,
change both
the fluid and filter.
An Emission Control Service.
0 If you haven’t used your vehicle under severe service conditions listed
0 Inspect Positive Crankcase Ventilation (PCV) valve.
150,000 Miles (240 000 km)
Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See “Engine Coolant”
in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test
the cooling system and pressure cap.
An Emission Control Service.
DATE I
7-37
ProCarManuals.com
Page 358 of 388
Part E: Maintenance Record Any additional information from “Owner Checks and
Services” or “Periodic Maintenance” can be added on
After the scheduled services are performed, record the
the following record pages. Also, you should retain all
date, odometer reading and who performed the service maintenance receipts. Your owner information portfolio
in the boxes Provided after the maintenance interval. is a convenient place to store them.
Maintenance Record
ODOMETER
DATE READING SERVICED
BY MAINTENANCE PERFORMED
7-46
ProCarManuals.com
Page 372 of 388

1998 GMC SERVICE PUBLICATIONS ORDERING INFORMATION
The following publications covering the operation and servicing of your vehicle can be purchased by filling 01
the Service Publication Order Form in this book and mailing it\
in with your check, money order,
or credit card information to Helm, Incorporated (address below.) \
~
CURRENT PUBLICATIONS FOR 1998 GMC
SERVICE MANUALS
Service Manuals have the diagnosis and repair information
on engines, transmission, axle, suspension, brakes,
electrical, steering, body, etc.
RETAIL SELL PRICE:
$90.00
TRANSMISSION, TRANSAXLE, TRANSFER CASE
UNIT REPAIR MANUAL
This manual provides information on unit repair service
procedures, adjustments and specifications for the 1998
GM transmissions, transaxles and transfer cases.
RETAIL SELL PRICE:
$40.00
SERVICE BULLETINS
Service Bulletins give technical service information needed
to knowledgeably service General Motors cars and trucks.
Each bulletin contains instructions to assist in the
diagnosis and service of your vehicle.
PLEASE COMPLETE THE ORDER FORM SHOWN ON
THE FOLLOWING PAGE AND MAIL TO:
Helm, Incorporated RO. Box 07130 Detroit, MI 48207
OWNER’S INFORMATION
Owner publications are written directly for Owners and
intended to provide basic operational information about th
vehicle. The owner’s manual will include the Maintenance Schedule for all models.
In-Portfolio: Includes a Portfolio, Owner’s Manual and
Warranty Booklet. RETAIL SELL PRICE: $1
5.00
Without Portfolio: Owner’s Manual only.
RETAIL SELL PRICE:
$1 0.00
CURRENT & PAST MODEL ORDER FORMS
Service Publications are available for current and past
model GM vehicles. To request an order form, please
specify year and model name of the vehicle.
OR ORDER TOLL FREE: 1-800-782-4356
Monday-Friday 8:OO AM - 6:OO PM Eastern Time
For Credit Card Orders Only
(VISA-MasterCard-Discover)
ProCarManuals.com