2003 GMC Sonoma Owner's Manual - Page 386

0 Change automatic transmission fluid and filter if the 0 Check readfront axle fluid level and add fluid as vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature reguiariy reaches 90°F (32°C) or higher. - In hilly or mountainous terrain. - When doing frequent trailer towing. - Uses such as found in taxi, police or delivery needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0 Rotate tires. See Tire Inspection and Rotation on page 5-66 for proper rotation pattern ana additionai information. (See footnote +.) 30,000Miles (50OQO km) il 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 #.) U Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). service. If you do not use your vehicle under any of these conditions, change thefluid and filter every 50,000 miles (83 000 km). 0 Rotate tires. See Tire Inspection and Rotation on page 5-66 for proper rotation pattern and additional information. (See footnote +.) 22,500Miles (37500 km) 0 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 #.) 6-19