Here is a prime example what super magnet plugs can prevent. This is a picture of the oil pump from a TR6060 Hellcat M6 trans that did not have super magnets fitted in it. The pick up tube has a fine filter on it but not fine enough to catch fines small enough that still cause damage. This type of oil pump relies on next to zero clearance (oil film only mostly) between the rotor, its mating female ring, and the case. To build pressure that mating relies on a tight seal between all, only oil film keeps them apart. See all these scratches on all surfaces in these pictures? Well thats not good to keeping a tight seal and making good pressure!! Add to that the M6’s pick up tubes fine screen gets clogged by the bigger pieces that don’t make it through and start to clog it, reducing flow and pressure even more!!
Here is a M6 drain plug
All that stuff would have definitely collected on the pick up tube screen and clogged it over time.
The oil pumps on most engines now use this type of gear rotor pump as well, our 6.2 engines included. The engine oil pick up tube has a screen on it as well, but it’s very coarse, stops about nothing short of pretty large pieces. EVERY piece that’s picked up by the oil pump gets squished between the rotor and its female mating piece and if hard enough (which most will be short of aluminum, how hard you think chrome alloy ring material is? And today’s coatings make them even harder!!) causes scratches and start to reduce pressure and flow. The oil filter is after the oil pump, there’s NOTHING there to protect you oil pump short of a super magnet creating a strong and wide collection field near the inlet screen. That’s what these super magnets do in the oil pan drain!!
In the Differential there is no screen, no filter, no nothing to catch metal contaminants, they just keep getting circulated round and round through the gear meshes and bearings causing wear and creating even more wear particles, ie it’s a vicious cycle without filtration. How to filter out though hard wear causing contaminants? Well without a costly and complex pump and filtration system a super magnet set is about it!!
Here’s collections on a Diff set.
Bottom line, they work!!