Drain plugs, at least some of them, used to have a magnetic tip; so when you changed the oil, you got most of the metal shavings that never made it to the filter. I believe they are still available, but I need to do some looking around for a source.
Personally, with today's oil filters and oils, I wouldn't bother with a magnet in the oil pan. But that is just me
-SM
Personally, with today's oil filters and oils, I wouldn't bother with a magnet in the oil pan. But that is just me
-SM