If by "straight" you mean non-synthetic then you need to call your dealership and have them flatbed your truck in for a flush and fill with the correct stuff.
From the 2015 diesel supplement
"Only use ACEAC3 SAE 5W-30 Synthetic Low Ash engine
oil meeting Chrysler material standard MS-11106 or
Pennzoil Ultra Euro L full synthetic 5W-30 motor oil"