GMC SIERRA CK2 1999 Owner's Manual page 385

Short Trip/City Scheduled Maintenance -- Gasoline Engines
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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
75,000 Miles (125 000 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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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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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)
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Vehicles With GVWR Above 10,000 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.
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DATE
ACTUAL
SERVICED BY:
MILEAGE
7-23