[/quote]Metallic particles in the engine are trapped by the oil filter. [/quote]
Not sure that this is true, on my old Astro, I used a Filtermag, several times I cut the old filters to find a lot of "fines" on the inside of the filter housing where the magnets had been, this is the stuff that too fine for the filter media, is that right?
my perspective is that magnets will help to reduce wear since they reduce any cummulative effect of buld up of these "fines".