2007 GMC Sierra 1500 Pickup Owner's Manual - Page 621

Additional Required Services (Gasoline Engine) 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 Engine Supplement. 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 (Gasoline Engines) on page 491. Allison Transmission® only: Change automatic transmission fluid and external transmission filter (severe service). See footnote (m). Allison Transmission® only: Change automatic transmission fluid and external transmission filter (normal service). 25,000 (40 000) • • 50,000 (80 000 75,000 (120 000) • • 100,000 (160 000 125,000 (200 000) • • 150,000 (240 000 • • • • • • • • • 621