2003 GMC Yukon Owner's Manual - Page 476

50,000 Miles (83 000 km) u Change automatic transmission fluid and filter if the vehicle's GVWR is over 8600 lbs or 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. 60,000 Miles (100 000 km) u Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. u Rotate tires. See Tire Inspection and Rotation on page 5-62 for proper rotation pattern and additional information. (See footnote +.) u Replace fuel filter. An Emission Control Service. (See footnote †.) u Replace engine air cleaner filter on vehicles without a restriction indicator. If equipped with a change indicator, inspect the indicator. If necessary, replace the filter. If vehicle is driven in dusty/dirty conditions, inspect the change indicator (if equipped) at every engine oil change. See Engine Air Cleaner/Filter on page 5-21 for more information. An Emission Control Service. (See footnote †.) u Inspect Evaporative Control System. Check all fuel and vapor lines and hoses for proper hook-up, routing and condition. Check that the purge valve works properly, if equipped. Replace as needed. An Emission Control Service. (See footnote †.) If you do not use your vehicle under any of these conditions, change the fluid and filter at 100,000 miles (166 000 km). u Change transfer case fluid. 52,500 Miles (87 500 km) u Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. u Rotate tires. See Tire Inspection and Rotation on page 5-62 for proper rotation pattern and additional information. (See footnote +.) 6-8