AWD Power Transfer Unit
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
Under normal service conditions, AWD power transfer unit fluid change is not necessary. Under severe service conditions, change AWD power transfer unit fluid at 15,000-mile intervals. Severe service conditions are trailer towing, police, taxi, or local delivery service.