That's interesting. Those things are surprisingly expensive. Are filter casings still metal? You can get a 12 pack of those neodymium magnets for under ten bucks on amazon. Bet they would work ok.Interesting info. I’ll add that I use a filter magnet on all cars with a metal spin on filter. It keeps those sub 5 micron metallic particles against the wall of filter. I got this idea from a Cummins site 15 years ago.
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