1999 GMC Sonoma Owner's Manual - Page 344

yellowblue Long Trip/Highway Scheduled Maintenance 60,000 Miles (100 000 km) (Continued) Inspect engine accessory drive belt. An Emission Control Service. Replace fuel filter. An Emission Control Service. (See footnote[.) j Replace air cleaner filter. An Emission Control Service. j Inspect fuel tank, cap and lines for damage or leaks. Inspect fuel cap gasket for any damage. Replace parts as needed. An Emission Control Service. (See footnote[.) j j 67,500 Miles (112 500 km) 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 +.) DATE ACTUAL MILEAGE SERVICED BY: 7-36