2003 Chevrolet Blazer Owner's Manual - Page 376

99,000 Miles (165 000 km) 0 Change engine oil and filter (or every 3 months, 150,000 Miles (240000 km) 0 Drain, flush and refill cooling system (or every whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 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. (See footnote **.) 60 months since last service, whichever occurs first). See Engine Coolant on page 5-23 for what to use. Inspect hoses. Clean radiator, condenser, presstire cap and neck. Pressure test cooling system and pressure cap. An Emission Control Service. 0 Inspect engine accessory drive belt. An Emission Control Service. 100,000 Miles (166 000 km) 0 Inspect spark plug wires. An Emission Control Service. 0 Replace spark plugs. An Emission Control Service. U If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. Long TriplHighway Scheduled Maintenance The services shown in this schedule up to 100,000 miles (166 000 km) should be repeated after 100,000 miles (166 000 km) at the same intervals for the life of this vehicle. The services shown at 150,000 miles (240 000 km) should be repeated at the same interval after 150,000 miles (240 000 km) for the life of this vehicle. See Part 6: Owner Checks and Services on page 6-26 and Part C: Periodic Maintenance Inspections on page 6-31. Manual transmission fluid doesn't require change. Cl Automatic Transfer Case Only: Change transfer case fluid. CI Inspect Positive Crankcase Ventilation (PCV) valve. An Emission Control Service. 6-17