Don't use a magnetic drain plug unless you know it is of very good quality, because I still have half of a magnetic drain plug in the sump lol, it cracked in the thread taking it out on a change. I have a inch and a half round temp resistant magnet on the oil filter now, it seems to do a good job when I open up the filter.
Also, on my car the ZF transmission has 2 large magnets in the pan which you can remove and clean when you do a drop pan fluid change.
Also, on my car the ZF transmission has 2 large magnets in the pan which you can remove and clean when you do a drop pan fluid change.