Chevrolet 2002 Astro Owner's Manual page 348

Short Trip/City Scheduled Maintenance
30,000 Miles (50 000 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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Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking.
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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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Replace fuel filter.
An Emission Control Service. (See footnote
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Replace engine air cleaner filter.
An Emission Control Service.
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