Time to change the oil, currently on Duron. So which one? The XD-3 is a PAO (says so on the Data Sheet), the Rotella T is an I don't know and the Duron is blend of some sort. My truck has run better than ever since I made the switch to HDEO. Now I just want to narrow in on a good one. Sorry, you US guys might not know about any Esso products.