2011 Cadillac DTS Owner's Manual - Page 322

When to Inspect the Engine Air Cleaner/ Filter Inspect the air cleaner/filter at the scheduled maintenance intervals and replace it at the first oil change after each 50,000 mile (80 000 km) interval. See Scheduled Maintenance on page 7 ‑ 3 for more information. If you are driving in dusty/dirty conditions, inspect the filter at each engine oil change. To inspect or replace the filter: How to Inspect the Engine Air Cleaner/ Filter To inspect the air cleaner/filter, remove the filter from the vehicle and lightly shake the filter to release loose dust and dirt. If the filter remains covered with dirt, a new filter is required. 1. Remove the two screws on the top of the engine air cleaner/filter cover. 2. Lift up the outboard side of the cover at an angle while pulling toward you. This is necessary due to the two hinges located on the inboard side of the cover. 3. Remove the engine air cleaner/filter and any loose debris that may be found in the air cleaner base. 4. Inspect or replace the air filter element. 6-20