My 2015 2500 is a 5.7 non-MDS engine, so it must have different oil. Have you checked what the dealer oil change costs?
I haven't yet, I also got 2 free oil changes when i bought it. I hope they stick to their word and don't try to charge extra?? i suppose I'm used to changing oil in my diesel, so cost is close any way. It's still worth it, I love this truck.
Have you checked what the dealer oil change costs? 
