My NASA TTA track car has logged 30k miles and recently I changed out the Pentosin BMW-DCTF-1 fluid (PN 83222147477 20-litre can) for the first time as a preventive maintenance.
The fluid was then sent out to Blackstone Labs for analysis.
Just received the results back. This was Blackstone's first sample of the DCT fluid from an M car, so they could not make a comparison between my gearbox and others. However, they did observe that the "wear is so low that [they] doubt any mechanical problems."
My car has logged over 400 hot laps at my home track MSR Houston alone, so I would presume that for regular street use, the DCT fluid will last quite a long time.
I would still encourage more owners to send in their oil sample at different mileages
(they only require 2-3 oz) so that we have a larger database to compare from.
The report is attached. The water mentioned was due to moisture caught during the collection process.