"Ever wonder what turns your oil from a golden amber brown to that icky black mess after a few thousand miles? A lot of things, but one of them is metal particles. Even under the best driving conditions and the most meticulous maintenance, your engine will shed a little metal. Over time, these particles can work their way back into the engine and cause wear on a number of key components such as valve guides, piston rings, and connecting rod bearings. An economical way to extend tile life of your engine is with the Magna-Guard filter insert. Just drop it into your filter when you change your oil, and replace it at each oil change. At only $3.00 a pop, it's cheap insurance against wear and tear."