GMC Sierra 2000 Owner's Manual page 396

Long Trip/Highway Scheduled Maintenance
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Diesel Engine Only: If your engine has a thermostatically controlled cooling
fan, inspect hoses and ducts for proper hook
whichever occurs first). Be sure the valve works properly. This is a Noise
Emission Control Service. Applicable only to vehicles sold in the
United States.
82,500 Miles (137 500 km)
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Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
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Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote #.)
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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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up (or every 12 months,
DATE
ACTUAL
SERVICED BY:
MILEAGE
7-47