I was running B100 bought from a local shop and it started to gel way earlier than I was led to expect: around 35F! My filters really got clogged. Now I'm down to about B50, but it's still a problem at around 30F. I know, I know: Stanadyne filter with heater-coil would help. In the meantime, what about additives or other techniques for melting those solids. This is key because the biodiesel may gel at one temperature but it doesn't necessarily melt again at a slightly higher temperature -- it needs help to melt. What if I bathe my filter and prefilter in kerosene for a while?