I make Boidiesel and run 100% it in my D24. I have close to 1000 gallons of WVO waiting to be process. I bought a Fuel Mister for a good price, and now building a new processor so that I can make 100 gallons in one batch instead of 40 gallons with the Mister. I'm going to sell the fuel Mister soon. Since Oregon is full of hippie's there are many fuel stations you can pick up B99 for a good price. The bad part of that when winter comes they only sell B20 until it warms up again. I've ran B100 in the winter with no problems. I had no problems besides the return lines to the injectors. I need to replace it with viton in the near future.
This might help
http://biodiesel.infopop.cc/6/ubb.x?a=cfrm&s=447609751