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Thanks but no, the device I remember seeing consisted of a metal box which mounted remotely, like on the side of a frame rail, and contained special filtration elements which could be replaced at certain intevals. The box had a sight glass to monitor the "color" of the oil. It removed all of the carbon and other contaminants from the engine oil and kept it looking brand new. It probably got bought off the market by the oil filter companies.Sharecropper,
Are you thinking about the "Oil REFINER" filter by Frantz?
Also known as Toilet Paper Oil Filters
See: http://www.toiletpaperoilfilter.com
Regards
Joseph