Ppe centrifuge is what got me thinking. I can change ny oil and a day or so later its black tinted already. Idk where to send oil samples but I'd like to know that my built motor is getting lubricated with good oil. Currently running regular rotella, not sure if its that bc rotella has went to crap or what. Not sure of what other oil is better to run and available locally.
I know you wrote that the engine is built, but do you have the egr system still operative?
I ditched the egr, used sea foam multiple times afterward both before an oil change and also in the crankcase with the new oil while driving, to try and break down and get the soot out of the engine, I run an aftermarket oil filter that is serviceable and filters down to 12 micron absolute via a surgical grade stainless steel mesh, I also have a PPE centrifuge, and it really works, it pulls plenty out even with the upgraded oil filter, and my oil still gets black in one day
right now I'm running royal purple fully synthetic oil and I like it, it holds pressure well under load and heat, even when hot at idle, the engine purrs nice and smooth and my fuel economy seems to be doing just a teeny tiny bit better since I started using it, maybe I just stopped beating my truck as hard tho
Modern diesel oil is formulated to be able to carry the soot and lubricate for thousands of miles though, so I wouldn't worry to much...