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Old 01-02-2010, 03:10 PM   #1
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Power steering fluid

Hi all,

Not really an engine thread but was not sure quite where to post so sorry administrators; please move if there is somewhere more appropriate.

My W203 is squealing like a little piggy when I turn the steering wheel.
Have checked the power steering fluid level and its not even registering on the little dip stick.

Does anyone know if I just ask the local motor factor for some power steering fluid or are there different grades?
If there are different grades what do I ask for?

Many thanks as always,
Nibbo
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Old 01-02-2010, 04:29 PM   #2
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Get the oil from MB. Its a green colour and called Pentosin.
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Old 02-02-2010, 10:01 AM   #3
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Get the oil from MB. Its a green colour and called Pentosin.
Thanks BlackC55, however I tried to contact my nearest dealer to see if they had it in stock and that it was available over the counter. It's a 30 mile round trip and haven't got the time to waste at the moment.
As usual, no-one available... can I get them to call you sir? but no-one ever calls back. Even filled out an on-line parts enquiry, still no call back. Grrrr...

Do we know for sure that they sell it to the public?
Or, I think the grade is CHF 11S; presumably I can mix any fluid of the same grade or will this damage seals etc...

Thanks again
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Old 02-02-2010, 10:22 AM   #4
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Originally Posted by Nibbo View Post
Thanks BlackC55, however I tried to contact my nearest dealer to see if they had it in stock and that it was available over the counter. It's a 30 mile round trip and haven't got the time to waste at the moment.
As usual, no-one available... can I get them to call you sir? but no-one ever calls back. Even filled out an on-line parts enquiry, still no call back. Grrrr...

Do we know for sure that they sell it to the public?
Or, I think the grade is CHF 11S; presumably I can mix any fluid of the same grade or will this damage seals etc...

Thanks again
How desperate are you for it?

I've got a few 1 litre tubs of it, at the very least I can get the part number them so you can get it locally.
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Old 02-02-2010, 10:24 AM   #5
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There are a number of firms that sell CHF Central Hydraulic Fluid to the required standard the S being synthetic, including Wynns, Comma, Febi and probably many more.
Pentosin is if I remember correctly an American brand.
If Mr M as above has some get it sent cheaper in fuel and time.

Last edited by goldestate; 02-02-2010 at 10:27 AM.
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Old 02-02-2010, 10:49 AM   #6
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How desperate are you for it?

I've got a few 1 litre tubs of it, at the very least I can get the part number them so you can get it locally.
Thanks Nick,
Not too desperate; let me know the Part No and I will order it from your website.
Cheers
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Old 02-02-2010, 01:40 PM   #7
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I'd be interested to know when Mercedes stopped using ATF in the power steering pumps and went over to this different fluid ?

I suppose I'd have to guess that it might be when they changed over from recirculating ball systems to rack & pinion ?
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Old 02-02-2010, 03:51 PM   #8
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The power steering fluid level should normally never need a top up unless the system has developed a leak.........check your system for any fluid loss, a common area for leaks is from the steering rack rubber 'boots' on the steering arms which is due to a failure of the seals behind.
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Old 04-02-2010, 02:45 PM   #9
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The power steering fluid level should normally never need a top up unless the system has developed a leak.........check your system for any fluid loss, a common area for leaks is from the steering rack rubber 'boots' on the steering arms which is due to a failure of the seals behind.
Good shout that man...

No sign of a leak so topped fluid up.
10 minutes later virtually no power steering at all; looked under bonnet and fluid everywhere so topping up must have increased the pressure and caused the undetectable leak to become a complete failure.
D'oh... managed to muscle it to a local garage who thinks it is just a seal; hope he is right.
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