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After making my own diesel fuel for 7 years, I would not bother with heating any waste oil prior to processing. I find I just add gasoline at 20% to any waste oil. Leave it to settle for at least a week, then pour off the light blend, leaving the thick sediments behind, then filter and/or CF it.

Most of the waste oil based fuel I make is made from WVO, and I thinned it with gasoline, then settled it for a week, then filtered it down to 1-micron with a series of filters. That method worked great for WVO blends. Then, I started experimenting with WMO through the same setup and method...