2012 GMC Canyon Owner's Manual - Page 340

11-8 Service and Maintenance Footnotes - Maintenance Schedule Additional Required Services - Severe a) Check all fuel and vapor lines and hoses for proper hook‐up, routing, and condition. Check that the purge valve, if the vehicle has one, works properly. Replace as needed. b) Or every four years, whichever comes first. c) 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. d) Or every five years, whichever comes first. See Cooling System on page 10‑18. e) Or every 10 years, whichever comes first. Inspect for fraying, excessive cracking, or damage; replace, if needed. Special Application Services . Additional Maintenance and Care Your vehicle is an important investment and caring for it properly may help to avoid future costly repairs. To maintain vehicle performance, additional maintenance services may be required. It is recommended that your dealer perform these services - their trained dealer technicians know your vehicle best. Your dealer can also perform a thorough assessment with a multi‐point inspection to recommend when your vehicle may need attention. The following list is intended to explain the services and conditions to look for that may indicate services are required. Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/ 3,000 mi. Have underbody flushing service performed once a year. .