2009 GMC Sierra 1500 Crew Cab Owner's Manual - Page 551

Additional Required Services This maintenance section applies to vehicles with a gasoline engine. If your vehicle has a diesel engine, see the maintenance schedule section in the DURAMAX® Diesel manual. The following services should be performed at the first maintenance service (I or II) after the indicated miles (kilometers) shown for each item. Additional Required Services Service and Miles (Kilometers) Inspect fuel system for damage or leaks. Inspect exhaust system for loose or damaged components. Vehicles without a filter restriction indicator: Replace engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-22. Change automatic transmission fluid and filter (severe service). See footnote (h). Change automatic transmission fluid and filter (normal service). Four-wheel drive only: Change transfer case fluid (extreme duty service). See footnotes (g) and (l 25,000 (40 000) • • 50,000 (80 000 75,000 (120 000) • • 100,000 (160 000 125,000 (200 000) • • 150,000 (240 000 6-7