All depends on how many you have? If it's just a few on the drain plug then
it's normal and the cause is from clunking in-out of gear.

"Brian" wrote in message
om...
I have a 75 Hp Mercury outboard that was made in 1984. The question I
have is that when I check the oil in the lower unit I have noiced
metal filings (silver colored). I am not sure what causes this and
what is necessary to fix this problem. Any suggestions would greatly
be appreciated. Thanks!