FilterMag Bottle Demonstration

If the shaker bottle were your oil filter, the normal wear-causing particles found in your oil would be trapped against the inside wall of the filter, just as they are trapped on the inside wall of the bottle.
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[@d0jones]

Very cool!

[@philipfarnam6013]

A few observations/opinions: #1: I've used FilterMags for years and I'm one of those fellows who cuts open their filters to see what's in there after a change. From these inspections, I can tell you that FilterMags absolutely do what they're represented to do. #2: Ferrous particles (iron and steel) are the hardest and most abrasive of any of the "wear metals" sloughed off by an engine, therefore most beneficial to remove. #3: What is removed/isolated are not "particles" or "shavings" or "filings" or anything close to what most people mean by those words. They are not naked-eye visible. Various TH-cam opinions by Scotty Kilmer and others that the oil filter takes care of them are wrong. From my observations/inspections (see below) it is apparent that they are small enough to pass right through the filter media.
The appearance of the captured/isolated material is a fine gray paste. I have no method to determine micron-size but I am reminded of Arco's infamous graphite oil from the 1970's. Arco used specially engineered graphite particles so fine they passed right through the filter media. That's the kind of fine-ness were talking about here. (Except graphite is soft. Ferrous iron and steel are hard and abrasive) In addition to observing that material clinging to the filter wall, I've removed the filter media and stretched it out. I carefully and conscientiously moved a strong magnet over the media for several minutes including all creases, peaks and flats. I was very throrough about it. What that magnet picked up was so close to zero I might as well call it zero. I'm no scientist but I think a reasonable surmise is that this material is so fine it passes right through filter media...similar to Arco's graphite. Clearly, the filter media picked up none of it. The FilterMag did all the work.
FWIW...these observations from daily-driver 2018 Subaru 3.6R with about 80,000 miles. (Oil/filter changes each 6,000. Purolator Boss. Pennzoil Ultra Platinum.) My UOA's are better than any I have ever seen from any source. In particular, my iron, other "wear-metals" and "insolubles" are consistently better than any others I've seen. If I bought a new car tomorrow, I'd slap FilterMags on it as soon as I drove it home. Simple, easy, they don't wear out....and they do exactly what they're represented to do. Do they make a difference in engine longevity/reliability? I don't have the wherewithal to undertake the testing that would answer that question. They surely do seem like a good idea to me, though. I will continue to use.