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I typically recomend against using WMO as the primary fuel source. Maybe using your own oil occasionally mixed in with a few hundred gallons of veg, but that is it. However, I do not have any hard evidence against it. If you intend to use WMO regardless, then I would filter it down to less than 1 micron absolute if possible. Keep in mind that waste motor oil by nature contains metal wear particles. A bearing surface in an engine may see a up to several hundred psi at clearances of .0020. Where injector clearances will be .0001 and up to just over 20,000 psi. So fine metal particles that will barely even nick an engine bearing will quickly destroy an injector.
However with that said, much the same logic applies to WMO as WVO, if you can get your WMO for free or cheap, and you get only "50,000" miles on your injectors, you are still money ahead after replacing injectors. Long Story short, when using WMO, make sure you filter, filter, filter.
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