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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > can old power steering fluid cause the wheel to become stiff?



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      04-11-2017, 03:52 PM   #1
byviolet
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can old power steering fluid cause the wheel to become stiff?

So I noticed a week ago all of a sudden that the steering wheel on my 335i had become quite stiff and hard to turn (and squeaks on occasion). I checked the power steering fluid and while the levels were okay, the fluid was a dark brown color instead of the pale green color it was supposed to be (the cap says chf 11s only). Can this cause the problems I'm describing?

Last edited by byviolet; 04-11-2017 at 04:02 PM.
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      04-12-2017, 06:42 AM   #2
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When I changed my old fluid, steering became lighter. It wasn't a very big difference, but still noticeable.
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      04-12-2017, 08:13 AM   #3
robthewrench
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The increase in stiffness is the pump not providing pressure to the rack (or the rack being bound up or damaged, but this is less likely).

The cheapest fix would be to change the fluid. If this does not work, you probably have a problem with the power steering pump and need to change it, but since this is much more expensive, you might as well start by changing the fluid.

If the fluid is really contaminated, it may have clogged up the pump over time. The power steering system is a closed system, so all that brown gunk is the seals and rubber in the power steering system deteriorating over time.
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      04-15-2017, 12:09 PM   #4
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yes do a flush it will help
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      04-16-2017, 06:38 PM   #5
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Not to hijack the thread, but I went to buy some new PS fluid (08 E93 335i), and all they had was the pentosin in the picture on the right.

Is there any difference between the one on these?
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      04-17-2017, 08:05 AM   #6
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Identical.

My local dealership started to carry the one on the right.
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      04-17-2017, 08:21 AM   #7
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Quote:
Originally Posted by sprp85 View Post
Identical.

My local dealership started to carry the one on the right.
Thanks. I guess these are the new bottles?
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