Serious question. I'm picturing a more or less automatic rig starting with a 55 gallon tank with a screened inlet.
Pour in the dirty oil, activating a float switch that engages the centriguge and a very low flow valve to let gravity drip dirty oil into the filter. When the dirty oil level drops to a certain point the valve closes and the 'fuge stops. I'd have to clean that between uses. The idea would be to fill the dirty tank and let it work on its own for a day or two. I can't use 50 gallons in a day so it really doesn't matter how long it takes.
The clean oil would drip into a 250 gal collection tank (a repurposed oil tank from a home furnace)
Finally, pump out clean fuel as needed into the vehicle. Once there is enough fuel in the collection tank, just adding waste oil as I get it would keep me topped up.
The question is, has anybody tried a system as automated as that and how did it work out, or is the idea too hairbrained? I love the idea of recycling waste oil (and saving money) but I really don't want to dedicate my weekends to making fuel for the week...
Bonus Points Silly question. If one filtered home heating oil using a centriguge, would the dye filter out, leaving nice iced tea shaded fuel? Not that I would do that, but I'm curious. Actually, tranny fluid is red, too. Would this clean that up?