2005 GMC Envoy Owner's Manual - Page 442

Additional Required Services 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. Replace engine air cleaner filter. See Engine Air Cleaner/Filter on page 5-19. Change automatic transmission fluid and filter (severe service). See footnote (h). Change automatic transmission fluid and filter (normal service). Automatic transfer case only: Change transfer case fluid. See footnote (g). Replace spark plugs. An Emission Control Service. V8 engine only: Inspect spark plug wires. An Emission Control Service. Engine cooling system service (or every five years, whichever occurs first). An Emission Control Service. See footnote (i). Inspect engine accessory drive belt. An Emission Control Service. See footnote (l). 6-6 25,000 (41 500) • • 50,000 (83 000 75,000 100,000 125,000 150,000 (125 000) (166 000) (207 500) (240 000