Drivers of vehicles with 6.4-liter HEMI engines should use 0W-40 ... Full synthetic oils will protect your engine for more than 10,000 miles in most circumstances, but you should change your oil ...

If the ambient temperature reaches -22.0°F or below, Ford recommends Motorcraft 0W-40 diesel oil ... either Motorcraft SAE 5W-40 full synthetic diesel motor oil or SAE 15W-40 Super Duty diesel ...