2004 Chevrolet Astro Owner's Manual - Page 343
2004 Chevrolet Astro Manual
Page 343 highlights
97,500 Miles (162 500 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 +). 150,000 Miles (240 000 km) u Drain, flush and refill cooling system (or every 60 months since last service, whichever occurs first). See Engine Coolant on page 5-24 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test the cooling system and pressure cap. An Emission Control Service. u Inspect engine accessory drive belt. An Emission Control Service. 100,000 Miles (166 000 km) u Inspect spark plug wires. An Emission Control Service. u Replace spark plugs. An Emission Control Service. 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. u Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. 6-23