What do you guy's think about oil filter magnets

Pros and cons

 

Pros: none, other than maybe your peace of mind.
Cons: they don’t do anything

If you want a better filter than the one installed, look at getting a bypass system that filters down to a smaller level such a 2 micron. The magnet is just a gimmick like any other vato zone item up by the counter when you’re checking out.

 

No benefit for the engine oil, but powerful Neodymium Magnets (hardware store / Amazon item) will catch & hold lot of steel gear wear particles if attached to the underside of the automatic transmission oil pan:

 

I used to do this a long time ago. Never saw anything from it after years running a magnet. So no, worthless in my opinion.

 

Considering most of the wear metals in a modern engine are non magnetic probably not much benifit, if you start wearing enough that a magnet is picking it up between oil changes you likely have bigger problems or your going too long between changes.
The only place a magnet might be useful in an engine is on the drain plug to provide early warning when you change oil if theres something attached to it that shouldn't be there.
Now transmissions, transfer cases, and differentials can benefit from a magnet (most already have one) as most of the wear surfaces are iron or steel and with the exeption of automatic transmissions don't have a filter.

 

You're probably right, worthless ???? - I placed two neodymium magnets ("free" - pirated from an old hard drive) on the filter of my Tacoma when new. After a couple of years, I decided to open up a filter after an oil change, for a look-see. There were two "shadow" imprints on the inside of the filter, mirroring the magnet locations, just discolorations with no tactile abrasive feel. The magnets attracted "something", I don't have a clue. So, I just keep moving them from filter to filter - 7 years later, engine still runs fine....... Placebo - LOL

 

When I first used a magnetic drain plug, there was always a little glob of black goop on the tip when doing an oil change. When I started running rare earth magnets on the outside of the oil filter canister, all of the black goop disappeared from the drain plug. Just gone, completely and immediately. So I know that filter magnets do something... but are they reducing engine wear? I don't know. I don't believe they catch 100% of the ferrous particles passing through the filter. But I do believe they extend the life of the oil filter by keeping those particles out of the media. But they have to be good strong magnets. I got some rare earth magnets for cheap, they are about 1/2 inch diameter and 1/4 inch thick. They are very difficult to pull off the canister and even more difficult to separate from each other. When they snap together, there may be pinched flesh, just ask my buddy's kids who were playing with them one day. I use 5 of these rare earth magnets and try to distribute them evenly around the sides of the canister.