Dodge recommends 5W30 oil for most common operating conditions. 10W30 is probably also satisfactory in most conditions. Whether or not to use synthetic oil is your choice and has no effect on your warranty, pro or con.
5W-30 is the preferred oil viscosity
5w305w30
10w30
inside of motor
75w90 gear oil.
On the bottom of the oil pan.
Single viscosity is high quality oil. Mulit-viscosity oil is used for in the winter.
10w30
5W-30 ( for all engines according to the 2000 Ford Explorer Owner Guide )
dilution will reduce the viscosity The effect of dilution on viscosity of oil is that it will decrease.
5 w 30
How to determine viscosity of coconut oil