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Originally Posted by Purplefade
It isn’t the worst thing you could have poured in there... when I first brought mine home the prior owner had used ATF in the PS and it had no ill affect.
Being anal retentive though I promptly siphoned it out when I got home and refilled with PS fluid, I did that dance a few times to make sure I got as much as I could out - been driving it for 6 years sense and she’s all good 
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Ummm...the e53 PS system uses ATF...not power steering fluid. Did you mistype and turned it around?
BMW's use either ATF or Pentosin CH 11S (hydraulic) fluid in its PS reservoir: