Section 18 (6.1L Engine (Service Information)): Cover-Structural: Operation
WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
The structural cover provides additional powertrain stiffness and reduces noise and vibration. The LX uses an integral structural cover/oil pan.