2008 Subaru Tribeca Owner's Manual - Page 336

11-14 Maintenance and service Air cleaner element WARNING Do not operate the engine with the air cleaner element removed. The air cleaner element not only filters intake air but also stops flames if the engine backfires. If the air cleaner element is not installed when the engine backfires, you could be burned. & Replacing the air cleaner element Replace the air cleaner element according to the maintenance schedule in the "Warranty and Maintenance Booklet". Under extremely dusty conditions, replace it more frequently. It is recommended that you always use genuine SUBARU parts. CAUTION When replacing the air cleaner element, use a genuine SUBARU air cleaner element. If it is not used, there is the possibility of causing a negative effect to the engine. The air cleaner element functions as a filter screen. When the element is perforated or removed, engine wear will be excessive and engine life shortened. The air cleaner element is a dry type. It is unnecessary to clean or wash the element. 1. Unsnap the two clamps holding the air cleaner case cover. 2. Open the air cleaner case cover and remove the air cleaner element. 3. Install a new air cleaner element. 4. To install the air cleaner case cover, snap the two clamps on the air cleaner case cover.