Abstract: A generally cylindrical magnetic oil filter unit adapted to be interposed in an engine lubricating oil filter or other oil containing compartment for removal of magnetizable particles entrained or suspended in the oil. The filter unit is formed by a plurality of bar-type permanent magnets slidably surrounding an elongated support rod and maintained in spaced-apart relation by like poles facing each other. One end of the magnet support rod is supported by an oil filter support head for maintaining the magnetic filter in spaced relation with respect to surrounding components.