A permanent magnet array iron filter has a generally circular collar made
of a high magnetic permeability material with a plurality of magnetic
assemblies interiorly disposed longitudinally around an interior
circumference therein. Each magnetic assembly has two magnets with
opposite poles facing the center of the filter and a gap between the
adjacent assemblies. This arrangement intensifies the resultant magnetic
field and projects the field deeply within the interior region of the
filter. Rare earth permanent magnets are used to maximize the magnetic
field. The collar may be coated with a plastic coating to protect the
filter. The collar has a gap to provide flexibility when sliding the
filter over an oil filter. The thickness of the collar may be adjusted to
meet the requirements of a particular application.