2006 GMC Yukon Owner's Manual - Page 394

Engine Air Cleaner/Filter See Engine Compartment Overview on page 5-12 for the location of the engine air cleaner/filter and the air filter restriction indicator, if equipped. When to Inspect the Engine Air Cleaner/Filter If your vehicle is equipped with an air filter restriction indicator, it lets you know when the engine air cleaner/ filter needs to be replaced. On vehicles with a restriction indicator, you should inspect the air filter restriction indicator at every oil change and replace the engine air cleaner/filter when the indicator tells you to. On vehicles without an air filter restriction indicator, inspect the air cleaner/filter at the Maintenance II intervals and replace it at the first oil change after each 50,000 mile (83 000 km) interval. See Scheduled Maintenance on page 6-4 for more information. If you are driving in dusty/dirty conditions, inspect the filter at each engine oil change. 5-20