Quote:
Originally Posted by xRide
All along I thought it was ATF, but I looked at the cap just now and it says CHF-11S. This reservoir was a replacement and I dont remember where I purchased it if it was an original part.
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The clue to your question is the highlighted text in your quote above.
BMW no longer makes the original ATF reservoir or lid with ATF on it for the generation BMW your 05 X5 falls within. The lid & reservoirs that used CHF 11 S Pentosin hydraulic fluid is what they substitute when a replacement reservoir or cap is required.
The most important thing to look at though...is the color of the fluid inside the reservoir. If it is reddish-pink...then it is indeed ATF. Pentosin CHF 11 S hydraulic fluid is green. And if someone incorrectly mixed the two...then you'd have a light muddy looking concoction in the reservoir...which you'd need to drain immediately.
You can verify the non existence of the ATF reservoir & lid by just looking up the PS reservoir and lid in the part database. Take note in the part nbr index that the only reservoir (item #1) available is listed as for CHF 11 S...and a label is supposed to be ordered that says ATF. Or if you only need the lid (item #2)...there's also a part nbr listed for ordering the label that should be mounted to indicate to anyone working on the vehicle that the PS reservoir contains ATF (not CHF 11 S).
I hope this helps makes sense of everything.
