GMC Sierra 2000 Owner's Manual page 395

Long Trip/Highway Scheduled Maintenance
75,000 Miles (125 000 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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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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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
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Diesel Engine Only: Check the air intake system installation to assure that
gaskets are properly sealed and that all hose connections, fasteners and other
components are tight. Also check to be sure that the air cleaner housing is
properly seated and the cover fits tightly. Tighten connections and fasteners or
replace damaged parts as necessary. This is a Noise Emission Control Service.
Applicable only to vehicles sold in the United States.
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