oil dilution with diesel

[wrench buster]

Hello all, Can anyone provide some information on the relationship with too frequent re-generations (code 3375) and rising engine oil level (fuel dilution). I have cleaned the EGR SYS. and replaced all of the Injectors with OEM ones. I have also had the DPF and DOC cleaned. I am stumped on this one. From my understanding the ECM injects fuel in the cylinders on the EX. stroke instead of having a 7th injector. My hair is turning grey on this and it's keeping me up at night. Thank you for your input. This is in a Freightliner M2 with Cummins ISL 9 (2014 Year)