2007 GMC Sierra 1500 Pickup Owner's Manual - Page 491

Engine Air Cleaner/Filter (Gasoline Engines) If your vehicle has a diesel engine, see "Pickup Models" under "Engine Air Cleaner/Filter" in the DURAMAX® Diesel Supplement for the correct inspection and replacement procedures. See Engine Compartment Overview on page 480 for the location of the engine air cleaner/filter and the air filter restriction indicator, if the vehicle has one. When to Inspect the Engine Air Cleaner/Filter If your vehicle has 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 (Gasoline Engine) on page 617 for more information. If you are driving in dusty/dirty conditions, inspect the filter at each engine oil change. 491