Engine oil filter.
FCA recommends 5w20 synthetic oil for the 3.6L petrol and 5w30 for the 3.0L Diesel.
On our side, being trucks made to work, we recommend the use of a slightly higher grade, which will help better withstand the temperature for a truck that works hard.
3.6L: 5.6L capacity of 5w30
3.0L: 9.0L capacity of 5w40