1997 Chevrolet Astro Owner's Manual - Page 350

I Short TripKity Maintenance Schedule I Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly reaches F 90 (32 C ) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as foundin taxi, police or delivery service. O O 90,000 Miles (150 000 km) 0Change engine oil and filter (or every 3 months, whichever occursfirst). An Emission Control Service. JI Lubricate chassiscomponents (or every 3 months, whichever occurs first). (See footnote#.) 0Check readfront axle fluid level and add fluid as needed. Checkconstant velocity joints and axle seals for leaking. (See footnote **.) 0For Two-Wheel-Drive vehicles only: Clean and repackthe front wheel bearings (or at each brake relining, whicheveroccurs first). I you do not use your vehicle underany of these f conditions, changethe fluid and filter every 30,000 miles (50 000 km). 7-26