Quote:
Originally Posted by Efthreeoh
Nope. All E9X are CHF-11S. There is no "random" luck about it; it would be a factory assembly line nightmare to have the same production models assembled "randomly" with different power steering fluid requirements.
The actual problem is the PS reservoir cap has a thin o-ring that flattens over time and allows fluid to creep past the cap seal. The oil works its way under the green sticker and eventually degrades the adhesive and the sticker falls off. BMW sells a replacement green sticker. Over the past 30 years I've had four BMWs, all which use the same PS reservoir and everyone of them has developed a seal leak at the reservoir cap that is cured by replacing the o-ring.
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There is a ventilation hole in the cap, a safety overflow valve that dumps excessive vapors or even fluid out of the system aka to your engine bay... no o-ring will fix this...