....
Deisel engines are designed to run on this stuff but it depends on the
level of filtering that has been done to it. ...

I was jawing with the guy at the counter of the local injector pump
specialists a couple of months ago and he claimed that bio-diesel was
causing pump failures. His assertion was that regular diesel has
lubricants added to it and that even commercially available bio-diesel
doesn't and that this resulted in much more serious pump wear. I
don't really have any idea how true that is though he did a good
looking job of rebuilding the pump so I guess he isn't a total
wacko... Maybe someone in the group knows more about this and if
there are any useful additives (I'm guessing detergent and lubricant)
that you might want to think about...

-- Tom.