Don't touch any tank that's not BMW original - nobody aftermarket can be trusted any more after Mahle went to China.
Reviews of Mahle expansion tank
9 votes
Hatte letztes Jahr einen neuen Ausgleichsbehälter für meinen E36 gekauft, der einfach nicht gepasst hat. War nicht dicht zu bekommen, egal was man getan hat. Es hat jedesmal bei der Montage den O-Ring verschoben, weil der Behälter einfach nicht ordentlich gefertigt war.
I have a newish expansion tank and cap from Mahle. I think my cap is from the premium line but the inside colouring underneath the cap is already washed off and the plastic feel and finish of the expansion tank seems a bit lacking. However I have completed 10k in it now and no problems whatsoever.
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