2003 GMC Sonoma Owner's Manual - Page 379

0 Change automatic transmission fluid and filter if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside temperature regularly 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 service. If you do not use yourvehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). 0 Inspect engine air cleaner filter if you are driving in dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote f.) 50,000 Miles (83 000 km) 5 If you haven't used your vehicle under severe service conditions listed previously and, therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. Manual transmission fluid doesn't require change. 51,000 Miles (85 000 km) t Change engine oil and filter (or every 3 months, l whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #,) 5 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **-) 48,000 Miles (80 000 km) 0 Change engine oil and filter (or every 3 months, 54,000 Miles (90 000 km) U Change engine oil and filter (or every 3 months, whichever occurs first). An Emission Control Service. whichever occurs first). An Emission Control Service. 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 5 Rotate tires. See Tire lnspection and Rotation on page 5-66 for proper rotation pattern and additional information. (See footnote +.) 0 Lubricate chassis components (or every 3 months, whichever occurs first). (See footnote #.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. (See footnote **.) 0 Rotate tires. See Tire lnspection and Rotation on page 5-66 for proper rotation pattern and additional information. (See footnote +.) 6-12