FUEL IN OIL 2010 CUMMINS ISC 8.3

UPDATE*
It has been almost 2 weeks since I blasted out the dpf with water and air and almost 3 weeks since we installed a new scr catalyst. So far the trucks runs good and regens only 1x every 24hrs (before was about 1x every 12hrs). Ive attached a regen history screenshot as well. Hg's dropped from avg mid to high 3's down to between 1-3hg. No codes thus far. I wanted to thank all that helped out and the time and advice you offered up. Hopefully this thread helps other truck owners out there and save them alot of headache!... Thanks again!