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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-01-2014, 06:37 AM
gvelco gvelco is offline
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Mein Auto: BMW E39 525i 2002
power steering fluid high pressure

i always have dirty (with oil)PS reservoir and hoses.my mechanic says that filter in the reservoir is clogged or something which causes high pressure=leaky hoses and oily tank
u may know that reservoir cap acts like vent valve and high pressure causes overflowing the oil which spills on the reservoir.

he advised me to change reservoir,but maybe the problem is clogged hoses and not reservoir itself,how to troubleshoot it myself?
is that filter washable or changeable ?? i can't find that filter as separate item on ebay!

Last edited by gvelco; 12-01-2014 at 06:40 AM.
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  #2  
Old 12-01-2014, 06:54 AM
pudl pudl is offline
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You must have missed this in the 'best links':

how to clean the power steering fluid reservoir internal filter (1) (2)
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  #3  
Old 12-01-2014, 07:38 AM
gvelco gvelco is offline
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pudl tnx
i'll check this
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  #4  
Old 12-01-2014, 07:49 AM
MuscleWagon MuscleWagon is offline
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The PS reservoir is only $20 and is easy to replace. For me it wasn't worth the PITA to attempt to clean. Sounds like you need to flush the ATF anyway. I recently replaced my reservoir and 2 PS hoses that enter/exit the reservoir. Very easy DIY and no more mess in the engine bay.
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Old 12-01-2014, 08:13 AM
gvelco gvelco is offline
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i'm interested how much oil contains whole PS system,250 ml?
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  #6  
Old 12-01-2014, 10:01 AM
edjack edjack is offline
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Less than 2 qts. Be sure to use ONLY ATF, NOT power steering fluid.

BTW, your mechanic made a bad call. There is no pressure in the reservoir.

The hoses are known to leak, esp at the reservoir, since the clamps fail. Check the sealing washer on the cap, too. Some have placed the end of a Q-tip in the vent hole of the cap.

The filter is captive, and this requires replacement of the reservoir.
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Old 12-01-2014, 12:18 PM
gvelco gvelco is offline
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can i mix different oils and is it safe?because i'm going to change only reservoir fluid
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  #8  
Old 12-01-2014, 01:46 PM
edjack edjack is offline
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Your call. If you don't know what's in there now, it's taking a chance. As I said, use only ATF.

You'll have to change the reservoir a good 5X to get most of the old stuff out.
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  #9  
Old 12-02-2014, 12:45 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by gvelco View Post
i'm interested how much oil contains whole PS system,250 ml?
In the words of Pudl, you must have missed this in the bestlinks, found by typing /power steering f3, to find the fluid volumes:
- PSF: Power steering fluid (1) (2) & power steering fluid flush DIYs (1) (2) (3) (4) & volumes (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #10  
Old 12-13-2014, 11:08 AM
gvelco gvelco is offline
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today i bought castrol dex3 atf fluid and will change it soon.
i have whining noise at cold start.somebody told me that adding fluid up to MAX mark cures that whine.i thought it should be between min and max mark
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  #11  
Old 12-13-2014, 11:56 AM
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bluebee bluebee is offline
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- How much volume of power steering fluid should you put in your E39? (1)

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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 12-13-2014 at 11:59 AM.
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  #12  
Old 12-13-2014, 11:56 AM
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johnstern johnstern is online now
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Min=cold
Max=hot(operating temp.)

If you fill to max with fluid cold, it will overflow when hot. This equals a big mess. Change the fluid and your whine will probably stop. You can start changing fluid by sucking the old fluid out of the reservoir and refilling with new. Do that for 5 or 6 days after driving vehicle each day and you will have changed most of the fluid.
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