Thank you for your interest. Electrostatic fields work by either attracting or repelling particles based on positive or negative charges. Opposites attract while similar charges repel. In oil the rate of flow must be slow enough to allow the particles to migrate and attach themselves to a neutral dielectric media. If the rate of flow is too fast then the particles will simply pass through without having enough time to attach to the media. If the rate of flow is too slow then of course it simply isn't going to "clean" enough oil to do any good. One must also apply enough high voltage to the oil to cause particles to migrate without electrifying the oil. This particular problem is overcome by using layers of pleated paper as the neutral media. I would imagine that other problems will come up such as particles dislodging from the media due to vibrations. But, who knows, perhaps if we build one and mount it on a car we may find out that really isn't a problem at all.
What are your thoughts?