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Old 01-30-2011, 06:59 PM
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QSilver7 QSilver7 is offline
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Location: Northeast Indiana
Join Date: Aug 2008
Posts: 9,164
Mein Auto: 1997 740iL / 2006 X5 4.4
Originally Posted by first540i View Post
from my transmission replacement i still have two quarts of pentosin atf 1 and i was wondering if i could use this in my power steering. any suggestions?

and also any other 540 drivers, is your steering wheel heavy when stopped or heavier when driving? i am experiencing lighter steering when driving and heavier steering when trying to park or parallel park. just wondering if it was normal.

I do believe that the power steering fluid list has been posted many times it is is a PDF list from the BMW TIS:

And it may not be clear to some that replied earlier because Pentosin is the name brand of a hydraulic fluid BMW has used for decades...especially in cars that had hydraulic brake boosters and rear self leveling system which also shared the reservoir with the power steering system.

The BMWs with those systems required the use of Pentosin CHF 7 or CHF 11 S and many owners would unfortunately top off their PS reservoir with ATF...thus ruining the fluid in the PS reservoir.

But it sounds like you actually used Pentosin ATF to refill your auto tranny...thus you probably have an acceptable ATF fluid (name brand Pentosin). Again, don't confuse Pentosin CHF 11 S or CHF 7 with Pentosin ATF. Click the link above to be sure.

Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

Last edited by QSilver7; 01-30-2011 at 07:18 PM.
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