I just can't see where taking out very small magic particles/bits would hurt anything. And might add to the life of the engine. But then again if it was THE answer to wear -you would find more magnets in cars and filters.
For example in an RV fridge- there is an anode rod the attracts corrosion. It's in all fridges. There could easily be a removable magnetic rod in the sump that you pull and wipe off at filter change time.
This might prove the magnet: find a car with a couple oil analysis to get a trend. Then add magnets- and see if there are changes or improvements.
BTW I put a magnet on the oil filter of Honda motorcycle back in the 80's so it's not a new discovery. And my dad installed a Frantz oil filter on all our cars in the 60's. it was my job to change the toilet paper cartridges- what a mess.
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