Here's the scenario/question: JH head rebuilt 15K ago on a 2H block with 90K. Everything runs fine, no oil consumption, no leaks, no smoke, good history, no abuse, regular oil/filter changes, correct viscosity, etc... I hesitate to admit that I use ho-hum oil and filters (I avoid those intense debates about which brands are superior).
I bought a magnetic oil drain plug on a whim and installed it last Fall during the previous oil change (about 3K ago).
Yesterday I changed the oil. It looked only as dirty as I would expect, otherwise fine, no sheen, no debris. However, there was a blob of dark grey/black "putty" on the magnet. It was smaller than a pea, bigger than a grape seed, very thick/smooth between my fingers, not hairy looking, not gritty at all. The particle size was clearly tiny, and it was clearly ferric (magnetic).
Before I take things apart when all else is well, to see if one of the IM shaft bearings is worn through to the bearing shell or something like that, I wanted to get opinions from here on what I should have expected on the magnet, i.e.: more than just a thin film of glop. It doesn't seem like the engine should be terminal yet when nothing on it has gone even 100K.
I should've never bought the darn plug, that way I'd have my head comfortably hidden in the sand .