Just an extra level of protection by magnetically trapping and preventing these too-small-to-be-trapped-by-the-oil-filter particulates to continue circulating through the oil. And what is seen on these magnets in a fully run-in engine aren't individual particles, anyway. (Hopefully the machining and break-in slag was already caught in the OEM filter long ago...) They're magnetically stacked individual microscopic particles formed into what appear to the naked eye to be solid "whiskers". Sludge starts with free circulating microscopic particles, among other things... ("From little accorns, mighty oaks grow.")
[ January 04, 2004, 02:16 PM: Message edited by: Ray H ]
[ January 04, 2004, 02:16 PM: Message edited by: Ray H ]