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Use the CHF-11S. The markings on the cap have you confused. The sticker is meant to cover the cap markings. BMW has been using that powersteering oil reservoir since the mid-80s so they've just put a sticker over the cap. The cap (without the sticker) is used on other BMW models that use Dexron for the power steering. All E90s with the N52 use CHF-11S.
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