2008 GMC Envoy Owner's Manual - Page 422

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 5-21. Change automatic transmission fluid and filter (severe service). See footnotes (g) and (h). Change automatic transmission fluid and filter (normal service). See footnote (g). 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. 6-6 • 25,000 (40 000) • • 50,000 (80 000 75,000 (120 000) • • 100,000 (160 000 125,000 (200 000) • • 150,000 (240 000