GMC Sierra 2000 Owner's Manual page 364

Short Trip/City Scheduled Maintenance
30,000 Miles (50 000 km)
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Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
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Lubricate chassis components (or every 3 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. 3500 HD Models: Change drive axle
fluid if the vehicle is driven in extreme overload, trailer towing and/or
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high speed (above 40 mph or 70 km/h) conditions for extended periods
of time.
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For Two Wheel Drive vehicles only: Clean and repack the front wheel
bearings (or at each brake relining, whichever occurs first).
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Replace fuel filter.
An Emission Control Service. (See footnote
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Vehicles With GVWR Above 10,000 lbs. or Equipped with Diesel Engine
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.
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(Continued)
DATE
ACTUAL
SERVICED BY:
MILEAGE
7-15