help, 190 has metal in the oil

[theonlykid]

i changed the oil in my 1991 190 e 2.3, and when i pulled the drain pan out i notices what looked like metal shavings. upon further inspect ion my fears were correct. i found quite a bit of shavings/ ground metal. didnt think @ the time to use a magnet to see what kind of metal it was. i am new to this whole car thing and definatly need some help w/ this one. how do i start to diagnose the source of the problem and or elminate others. thanks in advance for the help.