Chevrolet Metro 1999 Owner's Manual page 291

Long Trip/Highway Scheduled Maintenance
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Drain, flush and refill cooling system (or every 30 months, whichever occurs
first). See "Engine Coolant" in the Index for what to use. Inspect hoses. Clean
radiator, condenser, pressure cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service. (See footnote
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Replace spark plugs.
An Emission Control Service.
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Inspect ignition coil plug cap (1.3L Code 2 L4 engine only) (or every
30 months, whichever occurs first).
An Emission Control Service.
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Replace air cleaner filter.
An Emission Control Service.
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Change manual transaxle fluid (or every 30 months, whichever occurs first).
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Inspect the valve lash and adjust if necessary (1.3L Code 2 engine only).
An Emission Control Service.
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Inspect fuel tank, cap and lines and any hoses for damage (or every
15 months, whichever occurs first).
An Emission Control Service. (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 +.)
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