1998 GMC Sonoma Owner's Manual - Page 348

Short Trip/City W+tenance Schedule 90,000 Miles (150 000 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 o these conditions, change the f fluid and filter every 50,000 miles (83 000 knz). 0 Replace fuel filter. An Emission Control Service. (See footnote?.) 0 Replace air cleaner filter. An Emission Control Service. 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote+.) 93,000 Miles (155 000 km) 0 Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote**'.) DATE MILEAGE 7-26