Think about it. When you change the oil, what else do you change? Yes, you change the filter. Collecting small particles is the filter's job, and it is it quite good at it providing you use a top quality filter with a high micron-rating. You probably won't find much on an engine oil magnet since copper won't stick to it. Differential gears are made of iron and will stick. There are no filters in the diff, so a magnet might be a good idea. In my opinion magnets in the oil pan are about as useful as those little green and red rings people put on their batteries. I'll bet oil pan magnet salesmen had ancestors who sold snake oil from the back of a wagon. OK troupes and troupettes. I'm waitin for the blast!
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