I finally got around to speaking with a BMWNA rep (Erin) yesterday with whom I have been trading e-mails with regarding this issue and to whom I provided various forum links to the carbon build-up threads and I am disappointed to report that she/BMWNA could NOT answer even one question or provide any sort of response to the matter. In fact her response was, she is not aware of any problems and that I should express my concerns to my servicing dealer; to which I responded I already have they do not know anything.
The rep did say she was going to forward my e-mails and the forum links to the technical desk, but could not promise that I would recieve any kind of response - VERY SAD to say the least!