[h4waii]

Make sure to drain out the oil pan drain plug every once in a while to get the small shavings which should be stuck to the plug — it’s magnetic to hold on to them.

[winrid]

If you have that many shavings, motor is toast anyway.

Not every car has a magnetic drain plug. Most cars I've owned didn't.

Also, there's a reason you have an oil filter. The shavings don't go into the motor. Oil pump, maybe, but that's a given.