My last truck was a 2014 5.3. I had afm tuned out at under 1000 miles and returned it to stock 3.5 years later at 51,000 before trading it in. I ran it for a couple months like that and no problems at all. My current truck is a 2014 6.2 and now has 37k miles and is stock. Neither truck used any oil.
Rough country 2" leveling kit, 1" taller blocks in rear, 265/60/20r falken rocky Mountain tires, gm mud flaps, hids high and low beam, Truxedo lo Pro qt tonneau cover, magnaflow dual exhaust, range v8