I think XD3 has the edge on that one. I just finished a 12000 KM run in my 06 Cummins with it. While I like it for the cold weather, I have found that the Amsoil AME 15W40 that I just put in makes my truck run better overall. I also believe that the XD3 will shear a little more than most. Guess I will find out when I send in a UOA. Overall, I wanted a robust HDEO that could go over and above my OEM change intervals. Amsoil comes through on that.
