2004 Chevrolet Astro Owner's Manual - Page 339

45,000 Miles (75 000 km) u Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. u Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #). u Inspect engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-20 for more information. An Emission Control Service. (See footnote †.) u 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 90°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. If you do not use your vehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). u Rotate tires. See Tire Inspection and Rotation on page 5-62 for proper rotation pattern and additional information. (See footnote +). 50,000 Miles (83 000 km) u If you have not used your vehicle under severe conditions listed previously and, therefore, have not changed your automatic transmission fluid, change both the fluid and filter. u Change transfer case fluid. 52,500 Miles (87 500 km) u Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. u Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #). u Rotate tires. See Tire Inspection and Rotation on page 5-62 for proper rotation pattern and additional information. (See footnote +). 6-19