2014 Chevrolet Silverado 1500 Extended Cab Owner Manual - Page 481

Service and Maintenance Footnotes - Maintenance Schedule Additional Required Services - Normal (1) Or every two years, whichever comes first. More frequent replacement may be needed if the vehicle is driven in areas with heavy traffic, areas with poor air quality, or areas with high dust levels. Replacement may also be needed if there is a reduction in air flow, excessive window fogging, or odors. (2) Or every four years, whichever comes first. (3) Check all fuel and vapor lines and hoses for proper hook-up, routing, and condition. (4) Do not directly power wash 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. (5) Or every five years, whichever comes first. See Cooling System on page 10-20. (6) Or every 10 years, whichever comes first. Inspect for fraying, excessive cracking, or damage; replace, if needed. (7) Or every 10 years, whichever comes first. 11-7