Cummins X15 after treatment issues

[tree98]

Excessive soot production can have multiple causes. How often (looking with insite) is it asking for a regen?

Looking at the pipe itself is only a small part of what needs to be done.
When was the last time you did an EGR tuneup, where you actually replaced the IMAP and other sensors + cleaned out the Delta-P and exhaust pressure sensor passages, and replaced their sensors too?

Is it burning oil between oil changes?

Has it been asking for a parked regen? Have you been ignoring it ?

When were the cans baked last and who did it ?