1998 GMC Sonoma Owner's Manual - Page 356

Lcmg Trip/Highway Maintenance Schedule I 45,000 Miles (75 000 km) (Continued) When doing frequent trailer towing. - Uses such as found in taxi, police or delivery service. I f you do not use yourveh.icle under a n y o tlzese conditions, changethe jlfluid f and,filter every50,000 miles (83 000 km). 0 Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) - 50,000 Miles (83 000 km) 0 If you haven't used your vehicle under severe conditionslisted previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. Manual transmission fluid doesn't require change. ; DATE DATE ACTUAL MILEAGE I SERVICED B Y 52,500 Miles (87 500 km) c7 Change engine oil and filter (or every 12 months, whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 12 months, whichever occurs first). (See footnote#.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals forleaking. (See footnote*$'.) Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) I 7-34