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Here is a link to the Dieselcraft website. The have an oil centrifuge, model OC-20, which filters .93 GPM/55GPH for $289 delivered ($239 w/o mounting bracket). They claim to remove particles down to 0.1 micron, probably at the higher operating RPMs. I'd probably still use a prefilter of some...

Roger on the filter bag housings a couple of pics above. Not mine, I've run out of time to get all my projects done before the onset of cold weather. I don't have a heated garage (or an unheated one for that matter) to work in during the wintertime. Next springtime I'm going to get some 4" & 6"...

It all depends on what you are filtering. A highly mission critical fuel system might filter down to 1 micron absolute. A normal truck fuel system will probably filter 5 microns nominal, which is to say it could pass a small amount of 10 micron particles. A good oil filter may filter down to...

Ditto the above. Filtering foreign particulate to 5 microns or less allows those particles to pass through the injection pump and injectors without causing damage.

I agree, the washing machine ain't gonna work unless you can find a way to spin it at 8000-10000 rpm, in which case I don't want to be within a mile of it when you try it. IMHO, first choice is a filter bag. You can make a simple filter bag housing out of 4" and 6" PVC and a few fittings (see...

Yeah, all that stuff works, but with a bunch of effort. IMHO, the best bet is to make up a filter housing out of 6" PVC pipe with McMaster Carr filter bags to filter the crap out of your waste oil so you can burn the waste oil without crudding up your fuel filters and injection pump. Then add a...