I have a magnetic plug on my Kia. Long story short I needed to replace the original on my second oil change. The first oil change was done by the dealership. The Kia dealer paused filming of the latest Godzilla movie so Godzilla could tighten my oil plug for me. Getting it off was the most unbelievably ridiculous car maintenance experience ever. Anyway, I replaced it with a magnetic one. When I do oil changes there really isn't anything to speak of on it, so I don't think it does anything. Doesn't hurt though.
Oh, you should have seen the drain plug washer!!!