[TrackClub]

Originally Posted by Alpha1BC

It's like that primarily on the first two changes for the eLSD. The first change at 1500 miles prior to track use will contain all of the stuff that comes off the clutches during the initial wear-in, then the next change after the first track day will also contain a little more because track use wears the clutches in more than purely street use does. That's actually the reason the manual says the first track day shouldn't be driven all-out and then change diff fluid after that first track day. After that the fluid is noticeably cleaner for the subsequent 20-hr changes.

Bingo