1997 Chevrolet Astro Owner's Manual - Page 356

15,000 Miles (25 000 km) (Continued) - 22,500 Miles (37 500 km) 0Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. - 0Lubricate chassis components(or every 12 months, whichever occurs first). (See footnote #.) 0Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and * axle seals for lealung. (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 use your vehicle under anyf these o conditions, change thefluid and filter every 30,000 miles (50 000 km). 0Rotate tires. See "Tire Inspection and Rotation" in the Index proper rotation for pattern and additional information. (See footnote +.) DATE ACTUAL MILEAGE SERVICED BY: