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2014 ram 3500 6.4L 28000 miles, almost time for a 3000 mile change, don't really know what brands best for Hemi engine. Think maybe a Shell Rotella 5w40 ?
Ram recommends Penzoil Ultra Platinum synthetic 0W-40 for the 2019 Ram 6.4; not sure what the manual says for your 2014. NAPA had it on sale for $5.99 a quart, about a $4 savings. Did my first change at 4,000 miles last month.
That is what I use in mine with the Mopar filter. Purchase at wallyworld.
I have 127k on mine and change when the oil life says too. It starts ticking quietly about 50% and gets annoying about 20%, I make the plan to change at 10%.
I am sitting at 22% right now...looks like a cold oil change this time