It would seem that spinning the centrifuge with oil is the most common practice , although so little energy is required an electric motor might work better at even at idle,full cleaning speed would be obtained.
The larger OTR trucks have oil powered models that are serviced by replacing a paper filter like a coffee filter at tiny cost or effort.
The truck units are not white boat priced , BUT the mfg would not allow the unit to filter diesel fuel.
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