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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Change to synthetic whenever you want. It doesn't matter when you change. I will change to Mobil1 5w20 Syn at 9000 miles. Only because my dealer did the 3000 and 6000 mile change for free
I went to Mobil 1 5-20 at 3 grand. (08 Ram 1500 5.7L Hemi MDS) I use it in all my vehicles. I always change to syn. at first oil change that comes when I buy them new and used.