Chevrolet 1999 Express Van Owner's Manual page 340

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
52,500 Miles (87 500 km)
j
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote #.)
j
Check axle fluid level and add fluid as needed. (See footnote **.)
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
60,000 Miles (100 000 km)
j
Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
j
Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote #.)
j
Check axle fluid level and add fluid as needed. (See footnote **.)
j
Clean and repack the front wheel bearings (or at each brake relining,
whichever occurs first).
j
Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
j
Inspect engine accessory drive belt.
An Emission Control Service.
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