06 cm870 inframe oil consumption

[410truckin]

I recently had an inframe done to a 2006 isx cm870. I'm about 25k miles in and just the most recent oil change that I had, within 3 days I had to put a gallon and a half to get it to the halfway mark. I do about 398 miles a day 5 days a week. Why am I burning so much oil ? (Mandate deleted, new borgwarner turbo, cummins recon injectors, charge air cooler, etc) there are no leaks a a so it has to be going somewhere. Little to no visible blow by.