Understand effects of low temperatures on biodiesel Farm and Ranch Guide: Production News
Whew! You're right on that one!
I'm guessing I was thinking of some of the other properties compared to regular diesel...
Biodiesel - Wikipedia, the free encyclopedia
... the gelling section toward the bottom has some info, too...
When I had my diesel, I always had some anti-gel around for when it got down around freezing. I'm sure that there's just a couple of ingredients needed to make it...