Our friends at Autoblog are claiming they got some vague confirmation today from an M official that confirms the rumors of a 5 Series diesel tuned by M. However, according to the source, this is will likely not be a true M5 diesel but something between a regular series car and the current F10 M5. Think 550dM or 550dXM in name.

Also don ‘t be surprised if this is M ‘s first all wheel drive car based product. Do we believe it? While we have our doubts that this was really confirmed we do believe M is working on a 5 Series diesel product.

Go check it out at Autoblog.