Burning coolant

[tree98]

Trace amounts(25ppm) of potassium had shown up in oil samples but it was less each sample. Also the lab(horizon/amsoil)listed potassium as a possible coating on new bearings, I thought maybe that's what it was since it's a new engine and the number was tapering off(started at 33ppm)

I changed all the sensors about a year ago they looked normal, haven't taken them back out yet, all I did so far was drop the cans.

I've been chasing external coolant leaks on this thing for a while. I've probably added a little more than a gallon since it was new. I'm pretty sure whatever is leaking has been since it was brand new.

If the EGR cooler is just seeping, will I be able to catch it with the dish behind the cooler test you did in your video? I know Cummins sells test strips that supposedly find traces of coolant but I've heard those aren't exactly reliable.

I've been watching the aftertreatment history it hasn't been to bad considering this truck idles a lot. Usually a bunch of high 1's and low 2's. I would have thought if coolant was plugging the DPF the numbers should have shot up ??

Oddly enough, I had a 2018 isx12 that ended up needing an egr cooler, it also leaked from brand new. I thought these new coolers were damn near bullet proof??