GMC 1996 Sonoma Owner's Manual page 337

Long Tripmighway Maintenance Schedule
c ] Rotate tires. See "Tire Inspection and
Rotation" in the Index for proper rotation
pattern and additional information.
DATE ACTUAL MILEAGE SERVICED B Y
100,000 Miles (144 000 km)
0
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.?
0
Inspect spark plug wires.
An Emission Control Service.
0
Replace spark plugs.
An Emission Control Service.
(Continued)
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