Running crap fuel will do far more damage to the fuel system and engine than worrying about the FDC bypassed . You can't filter out the super fine metals or acids in used motor oil.
To get myself back on topic, this right here should be the final answer necessary. In the end, it's your motor and your $$$ if you don't believe us "naysayers." I've gone through a couple sets of injectors and IPs, even after running used motor oil through centrifuges, super-fine filtration and water removal methods, polishing, and the like...save the used motor oil for your shop's heating system. Run your Deuce on fresh, clean diesel from a commercial station, with your preferred lubrication added for your IP & HH.
You'll spend large sums of money to come to the same circularly-logical conclusion that myself & others have: it saves money to just go to the fuel station and fill it with pump diesel.
I know because I logged every gallon of "bio-diesel" and alternative fuel I processed over 5 years, including time & labor necessary to process it. I was the only person for several years licensed & registered in Nevada to process "bio-diesel" for PERSONAL use (NOT commercial). What I found was that for each gallon of "bio-diesel" I processed, it cost me on average $4.82 per gallon...not including the County & State fuel taxes I was required to pay monthly based on my reported production. I tried to be meticulous, as since I was the only person in Nevada licensed to this for personal use, I didn't want to set a bad example. The State paved the way for me to do this, as they were only set up to do it for commercial enterprises and I was the test bunny. So I made sure to document everything as best as I could, anticipating scrutiny from the State.
It's cheaper by far to create your own EPA-approved storage facility on your property and buy diesel in bulk for long-term storage and use, than it is to really get involved in running PROPERLY PROCESSED alternative fuels in your Deuce. But, your truck, your $$$, do as you think is best.
The "Alternative Fuels" sub-forum should have all the answers to your original questions and more.