Decoupling Elements
WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
There are decoupling elements at the bolts from the oil pan, oil pump, front cover, water outlet housing and more other parts. The elements are used to reduce the noise and vibration. Another reduction of engine noise is the engine sight shield and the noise pad at the oil pan.