I've seen this before on our cars. I'd believe this is also metal shavings. But not sure what is considered appropriate for there has to be a level considered for this.
I plan to change mine ever other oil change being I have a LSD. OS Giken recommends every 15K miles but I feel that's to long. Especially now that I'm starting to track. The OS Giken is post to run a little lower temps but I don't see it doing that on our cars but it might though. I'll end up changing my diff fluid after my next track day and I'll post my results. At the moment I have put 4K miles on mine and one track day.
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