I use filter mags and a magnetic drain plug. And in the oil analysis's I have done there has been no faster than normal drop off of metals in the oil. (More frequent oil changes would do better in reducing metal buildup) I agree that these magnets are just a placebo, if you want them get them but I would say you're better off having your used oil tested then hoping a magnet will help extend your engines life. With a test you can see a problem and take steps to fix it, with a magnet you're just hoping it will prevent one.
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