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Mehhh
I ran only filtered used oil for many years. When I did my headgaskets the injectors were worn out but the IP still worked. The money I saved could have paid for LOTS of injection pumps (and did).
Sure, you can play it safe and spend big bucks on a "fuge" but then, your spending big...
Honestly, you need to filter it first. I usually mix gas or diesel in the oil, then pump it through filters into the tank.
We have an "alt fuels" section you should read through prior to experimenting.