Earlier this year I bought a Ram 3500 with the 6.4 Hemi engine. I bought it over the phone and really didn't do much research on that particular model because I thought my '07 Ram 3500 was going to be in the shop for an extended period. One of the things I learned about my new truck is that it requires 0W-40 synthetic oil. I tried searching this forum to see if there were any discussions on this engine and oil, but didn't find any. Can anyone here tell me their experience with this engine/oil? Thanks!