2003 Chevrolet Avalanche Owner's Manual - Page 446

30,000 Miles (50 000 km) 0 Check readfront axle fluid level and add fluid as I l l Rotate tires. See Tire Inspection and Rotation on needed. Check constant velocity joints and axle seals for leaking. CI Rotate tires. See Tire Inspection and Rotation on page 5-59 for proper rotation pattern and additional information. (See footnote +.) 0 Replace fuel filter. An Emission Control Service. (See footnote t.) 0 Replace engine air cleaner filter. An Emission Control Service. page 5-59 for proper rotation pattern and additional information. (See footnote +.) 50,000 Miles (83 000 km) 0 Change automatic transmission fluid and filter if the vehicle's GVWR is over 8600 Ibs or if the vehicle is mainly driven under one or more of these conditions: - In heavy city traffic where the outside 37,500 Miles (62 500 km) Ll Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. 0 Rotate tires. See Tire Inspection and Rotation on 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 your vehicle underany of these conditions, change the fluidand filter at 100,000 miles ( I 66 000 km). 0 Change transfer case fluid. page 5-59 for proper rotation pattern and additional information. (See footnote +.) 45,000 Miles (75 000 km) 0 Inspect engine air cleaner filter if you are driving in 52,500 Miles (87 500 km) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. 0 Rotate tires. See Tire lnspection and Rotation on page 5-59 for proper rotation pattern and additional information. (See footnote +.) 6-7 dusty conditions. Replace filter if necessary. An Emission Control Service. (See footnote t.) 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking.