Magnetic oil plug - catch metal debris
 

This is what I do for my motorcycle and plan to do the same for my Boxster.

I use one of this magnet under my oil filter and under my drain plug. They are damn powerful and will pull and retain all inner debris until drained.

Amazon.com: 10 Neodymium Magnets 1/2 x 1/8 inch Disc N48: Kitchen & Dining

We have a member making and selling them here. Do a search and you'll find his offerings.