2003 Chevrolet Astro Owner's Manual - Page 340

37,500 Miles (62 500 km) C Change engine oil and filter (or every 12 months, I whichever occurs first). An Emission Control Service. Ll Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #). 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. D Rotate tires. See Tire Inspection and Rotation on page 5-64 for proper rotation pattern and additional information. (See footnote +). 0 Change automatic transmission fluid and filter if the vehicle is mainly driven under oneor more of these conditions: - In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such asfound in taxi, police or delivery service. 45,000 Miles (75 000 km) 0 Change engine oil and filter (or every 12 months, whichever occursfirst). An Emission Control Service. 0 Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote#). 0 Check readfront axle fluid level and add fluid as needed. Checkconstant velocity joints and axle seals for leaking. If you do not use your vehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). 0 Rotate tires. See Tire Inspection and Rotation on page 5-64 for proper rotation pattern and additional information. (See footnote +). 50,000 Miles (83000 km) 0 If you haven't used your vehicle under severe conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. U Change transfer case fluid. 6-21