Chevrolet 2000 Express Van Owner's Manual page 370

Long Trip/Highway Scheduled Maintenance
97,500 Miles (162 500 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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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
100,000 Miles (166 000 km)
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Gasoline Engine Only: Inspect spark plug wires.
An Emission Control Service.
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Gasoline Engine Only: Replace spark plugs.
An Emission Control Service.
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Change automatic transmission fluid and filter if the vehicle has a diesel
engine, if the vehicle's GVWR is over 8600 lbs. or if the vehicle is mainly
driven under one or more of these conditions:
– In heavy city traffic where the outside temperature regularly reaches
90 _ F (32 _ C) or higher.
– In hilly or mountainous terrain.
– When doing frequent trailer towing.
– Uses such as found in taxi, police or delivery service.
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