I use the Napa full synthetic with the Napa Platinum 47899 oil filter. (47899 is a 3rd gen hemi filter, larger OD, but it fits the 5th gen hemi Ram). Now that Napa has discontinued the Platinum line made by Wix.. I will be moving to Wix XP 57899. In my area, the smaller OD filter was not available so I found this alternative. The Platinum and the XP lines are optimized for synthetic lubricant.