2004 Chevrolet Astro Owner's Manual - Page 331

50,000 Miles (83 000 km) u If you have not used your vehicle under severe service conditions listed previously and, therefore, have not changed your automatic transmission fluid, change both the fluid and filter. u Change transfer case fluid. 54,000 Miles (90 000 km) u Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. u Lubricate chassis components (or every 3 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 +.) 51,000 Miles (85 000 km) u Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. u Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 57,000 Miles (95 000 km) u Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. u Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 6-11