Advice for Cummins isx

I’m an owner operator. I have a 2014 Pete with Cummins isx 550 that’s been deleted with 523,000 miles. I have high oil consumption due to carbon packing and now I suspect my injector cups are leaking bc I’m gettin coolant in fuel/water separator filter. I know a rebuild is not too far in my future. My question is, I may have an opportunity to buy a Cummins X15. It’s 2018 565 hp not deleted with 197,000 miles on it. Would it be better to rebuild my engine or buy the X15 and do a swap out?

 

this was my first truck so I couldn’t afford a new one. The emissions is a disaster and I would probably have the new one deleted also. And yes I believe I could have new motor paid off by then. The seller hasn’t set a sale price he told me to make him an offer. Any suggestions on what I should offer?

 

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tried calling my mechanic but he’s not open today. I know I gotta y’all to him before final decision. Just seeing if anyone on here has been in same situation and how it fared out for them. As far as what the engine comes with I don’t know yet. I am going to look at it later today. He says nothing wrong with it. He’s building a show truck and wants to put a cat 6NZ in it‍♂️

 

No have about 2 1/2 years left paying on the truck. The problem with swapping trucks is I do heavy haul and have very specific specs for what I NEED in a truck and there just aren’t any out there that are also affordable.