Trapping ferrous metal. I use the Dimple Plugs, the finest I've seen yet. (http://www.drainplugmagnets.com). Have them in all cars and previously in 2 aircraft.
Originally Posted By: tom slick
What benefit do you guys perceive from a magnetic drain plug?
I want to second Sam's comment about the Dimple brand plugs. I ordered a set for my BMW; engine, trans, and diff. I am ultra impressed with the quality of these parts - and I am a difficult person to please!