If you make your own fuel, you have to be very careful about how you process it.
If you do a 'water wash' of your fuel, (they mention this on 'trucks' but didn't show it) you have to be sure that you can dry the fuel
enough to not cause problems when you use it.
If you make your own fuel "You are your own warrente station".
I think the water wash is something that has to be done if you don't get your chemical amounts
correct for a complete (clean) reaction.
I am guessing that when you use the kit for testing the acidity of the input oils,
maybe you don't have to worry about the wash as the reaction is complete, with no leftover reactant. Or at least its enough that you don't
have to worry?
Bio-D from a big Mfg should be just fine. Its when someone cooking their
own B-D cuts corners and isn't careful about making sure the input material
is clean (filtering) and doesn't do the chemical tests to be sure that there
is no leftover chemicals from the reaction. Then you might run in to trouble. .
IE like the the VW mentioned above. .
BTW VW only recommends 5% bio-blend diesel right now. .
VW's take on BD
and Cummins -
Cummins stand on BD
One other thing to think about (not to be a kill joy but... ) is that biodiesel
will gell up at higher temps than #2. And from what I have heard about it
from a chemist who should know, there is no anti-gel that will work on
bio-D. I don't know this for a fact myself, just passing on what I heard.
I have never ran more than B-20 in my VW, and it was in the 60's for low temps at the time.
Never have ran it in my Dodge.
The stuff I ran was a SOY based bio-D supplied by Wacker Oil, in MI.
The fryer stuff would be based on different oils with some animal fat included.