The manual states that it is not reccomended due to the common rail needing quality fuel.
However i did post a thread in regards to using HHO/hydrogen supplimentation instead but not many replies to that.
At some point, i think i would rather do the hho supplimentation.
I asked because it has come out lately on the news that for these past couple of years the authorities gave permission so that bio diesel could be mixed to normal diesel supplied in all pumps. i don't know if that is legal or not but the mix is of around 3%. On asking i was told that this was still in the limits of normal diesel quality.