Kevin,
I searched your previous post and saw the user 'Branson3510' who was using 100% bio diesel in his new machine. I recommend asking him directly how it is going.
This subject is of great interest to me. I have used Bio diesel in my 2000 VW Jetta TDI with good results. For my Branson 3820, assuming it turns out that there are not any natural seal problems, I would add an anti-gel treatment to the bio diesel. Jim
3820 FEL, Backhoe