The diesel idea had previously been "confirmed" by one source, and Biermann acknowledged to Inside Line that if the technology were there, M Division wouldn't rule it out, but at the same time, he says the diesels currently available just don't provide the dynamics necessary to merit the M badge. A 5-Series M-tuned diesel had been the rumored candidate for precisely that treatment, but outside of the usual M Sports package, it doesn't look like it'll be happening soon.
![2008 BMW M1 Homage concept 2008 BMW M1 Homage concept](https://images.hgmsites.net/med/2008-bmw-m1-homage-concept_100189316_m.jpg)
2008 BMW M1 Homage concept
Nevertheless, Biermann told Inside Line that everything BMW does these days has to make money, and that includes the M Division. So for now, we'll settle for the regular production-based cars like the 1-Series M Coupe and the upcoming 2014 BMW M3. Happily.