This is why I always suck the old fluid out first.

Then fill the reservoir with either:

1. Blue ATE fluid (which is no longer available).

2. Regular generic DOT4 fluid from local store (such as BrakeBest brand from OReilly). I have used BrakeBest DOT4 fluid for > 10 years in my Volvos, BMWs without any issues.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT