OK, you guys have talked me into it. In big recip aircraft engines, we have an oil screen with presure sensors on either side. If chips clog the screen, the pressure differential trips a light in the cockpit that says, "That's all folks!" We call that Making metal and at the Reno Air races, when a big engine makes metal, its time to call it a day. If nothing else, it will be interesting to compare the chip load from time to time. Of course, the magnet doesnt work too well on non ferous metal.