Thank you Cowboysevens! I know I have never posted before, but I got to start somewhere. Chuckyr, I did start at the top of this thread and read every single post and could not find one response that stated what engine this was. I am not familar with this navistar engine, I knew it didn't look like any Cummins or Detroit that I have seen before. It does somewhat resemble a newer Caterpillar, but I wasn't sure if that was correct either because it's not Cat yellow. I'm excited to go research this 1:1 Navistar MaxxForce 15 now so I can learn more about it. This is a great looking kit of an exciting new truck!