Also. you'll find a wealth of information on this forum:
http://biodiesel.infopop.cc/eve/ubb.x
The SVO/WVO forum can be a bit slow for responses, especially when you're used to Pelican. THe Biodiesel side seems to be quite a bit more active.
FWIW, the older mercedes are supposed to be the best engines to run on alternative fuels, be it biodiesel or WVO. They are also a joy to work on and drive.