Chevrolet 2001 Express Van Owner's Manual page 383

Long Trip/Highway Scheduled Maintenance
90,000 Miles (150 000 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 axle fluid level and add fluid as needed. (See footnote **.)
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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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Diesel Engine Only: Replace engine air cleaner filter.
An Emission Control Service. Gasoline Engine Only: See "Engine Air
Cleaner Filter Restriction Indicator Check" in the Index.
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Vehicles With GVWR Above 10,000 lbs. Only: Inspect shields 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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