Click here to enlarge Originally Posted by cisi Click here to enlarge
yes i did, but i have the dpf deleted via ecu now. Its a cleaner solution in my opinion. But then harder you raise the rail pressure them more carbon is building up during combustion. Maybe a water injection system could help lowering that.
Without removing the dpf and raising the rail pressure you will sooner or later get problems with a full DPF. Mine was already full without any tunings at 80000 km. Cant imagine how bad it would have been if it was tuned for that 80000 km.
50k mi here or roughly 80Km and going through some deep cleaning of the engine right now.
The dealer had to replace the EGR valve and both turbos.
The DPF was actually clean.
The shop foreman explained to me that the valve between the two turbos was stuck because of the carbon deposits ant the smaller turbo almost non functional.
He recommended to block off the EGR valve in order to solve this issue.
Apparently the DPF regeneration worked fine, but being the last piece of equipment in the emission system it was not affected by the negative effects of the EGR valve.

Somehow the X5 diesel has a better system than the 335d in which the clean gases that come out of the DPF are returned to the intake instead of taking all that dirty spent air from the EGR and clog up everything else.

In my case, I don't think a DPF delete kit would help me much. EGR delete definitely would.