Gold Plug Magnetic Oil Drain Bolt

[2017EX_imp]

I would tend to agree with everyones observations, i.e., yes the most significant capture on the magnet is probably going to be during the initial break in, yes, after that probably what will be seen is normal wear resulting in a very fine black residue on the magnet, and yes I would be just as shocked to find a piece of metal on a magnetic drain plug as anyone else. That said, I did see first hand one time years ago, and more recently a couple of Youtube videos, where a small piece of a broken engine part had been captured by the magnet ( one looked kinda like a piece of valve guide ). In those instances, and assuming good oil change intervals, capturing a small piece of metal could alert the owner to an internal problem that might not otherwise be obvious. I just happen to like them ( magnetic drain bolts ), consider them cheap extra insurance, and personal preference. Magnetic or stock, one way is no more correct than the other, just an available option.