After the sock filters like Kip and everyone, I go one more step. I pump through a GoldenRod water separator filter as it goes into the vehicle tank.

I've run straight WVO before and probably will when I have my fuel heaters up and running but I'm currently mixing my WVO with B100 for a final concentration of about 80% WVO/20% B100.

I'm in central Texas and the temps are mild so far. I'm mildly concerned about the viscosity increasing pumping pressures in the IP and ultimately altering the timing. Soon I'll have a couple of heaters installed in the fuel lines for each car and will be running the oil to the IP at approximately 140°F.

FWIW, I run crude cloud point tests in each batch I filter using baby bottles filled with the approximate mixture I have in the vehicle tank. I put one in the refrigerator and one outside. The fridge test is pretty viscous at 45°F and about the consistency of a milk shake at 38°. The bottles in the ambient air range in viscosity from what you'd expect cooking oil to be all the way to a diesel-like thinness when sitting in the sun during the afternoon (+85°F).

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Never a dull moment at Berry Hill Farm.