[Raydye]

If you find unidentifiable steel bits on your magnetic oil pan plug, check your valve springs. The top of the valve springs in my 2007 Z06 were ground paper thin when manufactured, and predictably, the tips of the wire broke off and collected on the oil drain plug. No other damage, so far.

 

[extanker]

thanks for the tip ,so far just a little metal 'dust'