The Libby loves biodiesel. I've put 80k miles on it using B100 and mixtures throughout the seasons, with no issues. I've plugged a filter once, and gelled a couple of times, but it performs on B100 just like normal.
On the other hand, there are a few vegetable oil conversions out there, and some of those have ended in disaster, mostly due to blowby polymerizing in the sump, and cooking bearings when the oil system loses lubrication. I would NEVER run even a little vegetable oil in the CRD; the injectors alone are $800 each to replace.