These question arise when the owner does not read his owners manual. Recommended in every case. Its recommended to get on the diesel forums and read the discussions on the various fuels and what works and what does not. Also other problems that might come up that your not aware of.
Right now on the TDR, a guy is working on his 2012 Ram 6.7 and installing a CNG system to use with diesel fuel. Interesting read.
Thanks for the reminder to read the owners manual. In this case i started with the owners manual and there was reference to anything to do with BIODIESEL.:(