Carbon and EGR, a hypothesis.
Does anyone have any data which compares EGR rates in US to EU? I wonder if due to the fact our emissions standards were higher at the time BMW had to increase the utilization of EGR on US models. It's this increase that is causing the problems and not actually the fuel.
I don't think BMW could actually admit it, but does this seem plausible?
Maybe one of the tuners who have seen the DDE Coding could chime in.
Current: 435i, M-sport, MPPK, 8SP
Previous : e90 335d, e90 330i, e46 330 zhp.