After draining my 1995 Bravo 3, I found similar metal shavings on the upper drain plug, in addition to small pieces of metal in the lube itself. Here are some pics, should I be concerned?
While draining the gear lube last night, I found both metal dust and larger metal fragments in the gear oil. Oil smelled and looked fine otherwise. It almost looked like new oil trying to mix with old oil in addition to a silver slurry spread throughout. The large pieces sank to the bottom. The top magnet had pieces stuck to it as well. As this is a new to us boat, I can't say the service history but the drive seemed to operate fine before.
Thoughts? The drive does shift a little rough. It tends to clunk into gear, but otherwise has been fine behind the 7.4l stock 454.