2008 GMC Yukon Owner's Manual - Page 500

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. Vehicles without a filter restriction indicator: 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). Four-wheel drive: Change transfer case fluid. See footnote (g). Inspect evaporative control system. An Emission Control Service. See footnotes † and (k). Replace spark plugs and inspect spark plug wires. An Emission Control 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 6-6