I have seen the centrifuges used for people that make their own biodiesel or burn waste veggie oil.
They work by using centrifugal force to keep any dirt, contaminants, and water in suspension pressed to the outside of the canister. As you keep adding more oil, the dirt sticks to the outside still, and the clean oil sorta overflows and leaves out the bottom.
I dont know how well this would work for engine oil since you use the oil pump pressure to spin the device, and then it seems like you let it go back to atmosphere.
Depending on the nozzles, you can filter down below 5 microns.
I would think this works better for fuel or if you drained out a bunch of oil from your transmission and wanted to clean it before you put it back in instead of motor oil, but others would know much more than me.
Here is some good info.
http://www.dieselcraft.com/WVOVideos.php
Hopefully this is the type of filter you were talking about....
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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