1997 Chevrolet Astro Owner's Manual - Page 341

I Short TripKity MaintenanceSchedule I 48,000 Miles (80 000 km) In heavy city traffic where the outside temperature regularly reaches 90 O 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. - Cl Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 0Check readfi-ont axle fluid level add fluid and as needed. Check constant velocity joints and axle seals for leaking.(See footnote **.) 0Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) If you do not useyour vehicle under any these of conditions, change the fluid and filter every 30,000 miles (50 000 km). 0Inspect air cleaner filterif you are drivingin dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote-t..) DATE ACTUAL MILEAGE SERVICED BY: 7-17