2011 Chevrolet Suburban 2500 Owner's Manual - Page 495

Service and Maintenance Once a Year . 11-5 See Starter Switch Check on page 10‑33. See Automatic Transmission Shift Lock Control Function Check on page 10‑33. See Ignition Transmission Lock Check on page 10‑33. See Park Brake and P (Park) Mechanism Check on page 10‑34. Accelerator pedal check for damage, high effort, or binding. Replace if needed. Underbody flushing service. Hood/Decklid/Liftgate/Liftglass Support Gas Strut Service: Visually inspect gas strut, if equipped, for signs of wear, cracks, or other damage. Check the hold open ability of the gas strut. Contact your dealer if service is required. First Engine Oil Change After Every 80 000 km/50,000 Miles . . . Engine air cleaner filter replacement. See Engine Air Cleaner/Filter on page 10‑15. Automatic transmission fluid change (severe service) for vehicles mainly driven in heavy city traffic in hot weather, in hilly or mountainous terrain, when frequently towing a trailer, or used for taxi, police, or delivery service. See Automatic Transmission Fluid on page 10‑12. . . . . . . Four‐wheel drive only: Transfer case fluid change (severe service) for vehicles mainly driven when frequently towing a trailer, or used for taxi, police, or delivery service. Check vent hose at transfer case for kinks and proper installation. Check to be sure vent hose is unobstructed, clear, and free of debris. During any maintenance, if a power washer is used to clean mud and dirt from the underbody, care should be taken to not directly spray the transfer case output seals. High pressure water can overcome the seals and contaminate the transfer case fluid. Contaminated fluid will decrease the life of the transfer case and should be replaced.