Hello, I am new to this I live In Heber City, Utah, it gets rather cold here, about -10 F I have been doing a lot of research on the wintron xc30 as well as the baynox stabilizer for long term storage. I also went to the purlite dry wash filter system. My contact in Norway has been using the two together down to -40 C which is pretty close to where I need to be to run b100 year round. my tests in the freezer have proven quite promising, but compared to some of the biodiesel I have seen. I must say mine is very clean. I run off a variety of vegetable oils, from various resaurants in the area. Primrose boasts they can drop it 15 degrees, but I tested it in the freezer and it did not look hopefull, I would stay with the blend. However, I never thought about simply putting a block heater in. Does anyone else use the purlite system, and have you had the same good results?