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Originally Posted by blue2000s
The problem with the magnetic plug is that hardly any of the oil is exposed to that small area. It can only hold onto particles that pass very near the plug. The magnets on the filter have exposure to much, much more of the oil.
How effective are they? I don't know but I suppose neither one could hurt anything. There's plenty of iron in the engine, even if the block and heads aren't made from it.
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You can check out this
http://www.carbibles.com/engineoil_bible.html (about 3/4 of the way down the page) where the guy lists another company and also shows you how to use a couple of hard drive magnets to build your own, if you decide on going this route.
One thing I would worry about, and I haven't found an answer, is that many anti-wear additives have polar molecules and I don't know if the magnets would attract these. Good luck.
Regards,
paul...