Sae Viscosity
Vehicles with 5.7L engines equipped with Multiple Displacement System (MDS) must use SAE 5W-20 oil. Failure to do so may result in improper operation of the Multiple Displacement System (MDS). Refer to Multi Displacement System under Starting and Operating for details. Refer to the engine oil filler cap for the recommended engine oil viscosity for each vehicle. An SAE viscosity grade is used to specify the viscosity of engine oil. Use only engine oils with multiple viscosities such as 5W-20 or 5W-30. These are specified with a dual SAE viscosity grade which indicates the cold-to-hot temperature viscosity range.
6.4L engines. For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends full synthetic engine oils SAE 0W-40 that meet the American Petroleum Institute (API) categories of SM or SM/CF. meeting the requirements of Chrysler Group LLC Material Standard MS-10725.
The viscosity grade is also listed in the vehicle quick reference specifications. Refer to CAPACITIES AND RECOMMENDED FLUIDS, SPECIFICATIONS .