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My 2013 and my 2017 cummins, Synthetic oil is NOT recommended unless in extreme cold temp where the ambient temp is 20 deg or lower. The dealer will not put it in and says it can void warranty.
I know im going to get slack from that statement but it does say it in the owners manual.
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2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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