Neodymium magnets on oil filters possible problems

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Just because there's slime on the magnet doesn't mean the filter is missing it. It's entirely likely that there's accumulated insols on the bottom of the pan and Its never actually being circulated thru the filter,so your assertion that just because your magnet is catching it doesn't mean the filter wouldn't.
And though I might agree with the idea in the real world spending money to try extend engine life when it's not the engine typically that condemns a vehicle to the recycler is tough for me to justify
Unless there's a problem that requires addressing what's the real point. Where's the line of redundancy?

I'm asking [/quote]

We know if the particle is below the filters threshold that the filter wont catch it for certain. This is where a magnet as a secondary level of filtration can catch it if the composition and proximity conditions are right, maybe not on one pass but likely in several.

Like I said above if you know have a finite life in a certain application and that by being very fastidious you can re use specific components (high dollar crank) vs trash them in the future the level of redundancy then becomes meaningful.

For your average buick- probably not so much.
 
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