2011 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 523

Service and Maintenance Once a Month . . 11-5 Tire inflation pressures check. See Tire Pressure on page 10‑63. Tire wear inspection. See Tire Inspection on page 10‑69. Sunroof track and seal inspection, if equipped. See Sunroof (Extended Cab) on page 2‑20 or Sunroof (Crew Cab) on page 2‑21. See Starter Switch Check on page 10‑38. See Automatic Transmission Shift Lock Control Function Check on page 10‑39. See Ignition Transmission Lock Check on page 10‑39. See Park Brake and P (Park) Mechanism Check on page 10‑40. 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 40 000 km/25,000 Miles . . . . . . . Once a Year . . Four‐wheel drive only: Transfer case fluid change (extreme duty service) for vehicles mainly driven off‐road in four‐wheel drive. Vehicles used for farming, mining, forestry, Department of Natural Resources (DNR), and snow plowing occupations meet this definition. 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.