You have to recheck the fluid (cold) after the track. You will likely need to add Pentosin CHF11 from time to time. If you've been to the track and couple of times and never added any then that could have contributed to the failure.
Apparently, CHF11 evaporates quickly as well.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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