Nothing to do with the fuel, per se

The chemicals to mix them can retain moisture..... Could be Deadly, if water is passed thru

 

There should be no traces of chemicals left in biodeisel after it has been made. Contrary to what people say and think Biodiesel is by far better than regular diesel. here in the US we have the lowest grade of diesel in the world per cetane rating. US diesel has a cetane of 40 while European has a Cetane of 51 and good old Biodiesel has a Cetane of 47. For those who do not know what that means its how well it will burn. Like the octane rating of gas