Originally Posted by
Thieuke
Look, personally I think you do not have to worry about anything. I think it's a washer that doens't belong in the engine anyways. Maybe it fell in during maintenance or something (wouldn't be the first time).
It happens to be that I'm currently disassembeling a 3.0t v6 Saab 9-5, this weekend I'm going to take the engine out. I will take a look in the engine, behind the sump to see wether such washers are a part of the b308. I'll even make pictures, so you can see.
The washer is probably shiny because it was loose for a while and bumped into stuff in the sump. You want to be sure? take of the sump and have a look yourself.