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I get nice used WVO from a local store. Its clean and bright with a slight white haze. Best way I found for preparing it is to First let the WVO sit still for a week- heavy contaminants sink. Than Transfer the top cleaner stuff to another container. Next I add anywhere from 20-40% Kero and allow to sit for a week or so. This does 2 things: one it thins the oil significantly and prevents thick sludgyy WVO even in cold weather and 2 Kero seems to make all the non oil contaminants sink to the bottand forming a layer of whitish brown sludge leaving only clean and clear WVO on top. Also adding Kero creates some kind of an emulsifing effect that prevents the formation of fatty solids. In my tests diesel mix did not do as well for cleaning up the WVO, not sure why.
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