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Originally Posted by nogoodname007
yeah, i got it now.....you would need a serious magnet to get the those metal particles.
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From filtermag webstie:
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In order for FilterMAG™ to remove minute steel particles from the oil system, its magnets must have enough energy to hold incredibly fine particles against the velocity of the oil flow. FilterMAG™'s patented design employs a focused magnetic force field, that amplifies its incredibly powerful Neodymium magnets, to generate the immense force needed to forcibly remove tiny particles below 20-micron from the oil flow; and retain increasingly smaller particles -- as small as 2-microns -- against the pressure of oil flow velocity.
FilterMAG™'s patented magnetic flux amplifier technology redirects the magnetic energy normally present on the far side of the magnet towards the inside of the filter canister. The flux amplifier has to be of a precise thickness to maximise the magnetic field. The circumference is adjusted to allow for manufacturing variances to result in a precise fit & alignment of the series of magnets to the filter canister. This focuses the maximum amount of magnetic energy within the oil flow. The successful and proven result is a masterpiece of automotive engineering.
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conclusion: Neodymium magnets = very strong magnet.