1999 Chevrolet Blazer Owner's Manual - Page 384

yellowblue Long Trip/Highway Scheduled Maintenance 15,000 Miles (25 000 km) (Continued) - 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). Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) j j Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. j Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote #.) j Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) j Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) 22,500 Miles (37 500 km) DATE ACTUAL MILEAGE SERVICED BY: 30,000 Miles (50 000 km) An Emission Control Service. j Change engine oil and filter (or every 12 months, whichever occurs first). 7-30 DATE ACTUAL MILEAGE SERVICED BY: