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1995 E320 Wagon, 2002 S430
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Discussion Starter #1
Wondering if Pentosin CHF 11S is a suitable fluid for the power steering system on an M103 (1991 300E). Thanks.
 

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2001 E55 Estate
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You could use CHF 11S if you had to, but for the price, ATF or Redline Power steering fluid is a better choice. I use Redline power steering fluid in my 87, 91 300TE, and everything that does not specify CHF 11S.
 

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1995 E320 Wagon, 2002 S430
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Discussion Starter #4
Apparently not (look at the document that was attached in the 3rd or 4th post: http://www.benzworld.org/forums/w202-c-class/1273555-question-about-power-steering-fluid.html

It's used for the newer models. According to MB, dextron transmission fluid is a better alternative.
Can anyone else confirm that Dexron III is a suitable PS fluid for this particular W124? I'd much rather pay $3/qt for Dexron III ATF to flush/fill the PS reservoir than paying $12/qt? for MB PS fluid. And Red Line make good products too, but $11/qt is not much of a break either.
 

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86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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Pour it in... Shouldn't present any problems. Valvoline PS fluid also works well.

Jayare
 

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1977 230, 1990 300E 2.6
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DO NOT use ATF for your power steering fluid. Mercedes specified ATF in the W123 series and changed to power steering fluid for the W124 series (not certain of the date). ATF, with it's friction enhancers, has been found to cause premature wear to internal parts of the steering box over time. GM and many other manufacturers changed their recommendation many years ago. Ask any steering box rebuilder about the difference in demand for steering boxes between the W123 and W124 series - dramatically higher replacement percentage in W123s. My '77 W123 went through two steering boxes in 155K miles with gentle, mostly highway driving. No abnormal wear on any other steering parts. I flushed the system and it now has power steering fluid along with the original steering box that was rebuilt. Power steering fluid is available everywhere and is not expensive. No need to buy the high priced stuff. Any name brand will do. I use Valvoline in both my cars.
 

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DO NOT use ATF for your power steering fluid. Mercedes specified ATF in the W123 series and changed to power steering fluid for the W124 series (not certain of the date). ATF, with it's friction enhancers, has been found to cause premature wear to internal parts of the steering box over time. GM and many other manufacturers changed their recommendation many years ago. Ask any steering box rebuilder about the difference in demand for steering boxes between the W123 and W124 series - dramatically higher replacement percentage in W123s. My '77 W123 went through two steering boxes in 155K miles with gentle, mostly highway driving. No abnormal wear on any other steering parts. I flushed the system and it now has power steering fluid along with the original steering box that was rebuilt. Power steering fluid is available everywhere and is not expensive. No need to buy the high priced stuff. Any name brand will do. I use Valvoline in both my cars.
According to my records, ATF has been in my power steering system for close to 120k miles. I show no signs of leakage, wear or abnormal noises.

But I must add that I have since flushed and replaced with Redline PS fluid.
 

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You may luck out using ATF but it definitely increases chances of wear when used. Tech Service bulletins were issued years ago by many manufacturers recommending the change from ATF to power steering fluid.
 

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2001 E55 Estate
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Found this TB at work:

Date: January 19, 2010

Order No.: S-B-46.25/70

Group: 46

SUBJECT:
MY-All, Models 124, 129, 140, 163, 164, 170, 171, 199, 202, 203, 204, 207, 209, 210, 211, 212, 215, 216, 219, 220, 221, 230, 251, 463

Approved Hydraulic Fluids for Steering Systems

Only use the following approved fluids in the event of hydraulic steering system repairs:

Hydraulic fluid A according to sheet 236.3; hydraulic fluid B according to sheet 345.0; and hydraulic fluid C according to sheet 344.0 (see Parts Information below).





On a side note: I remember hearing through MB technical training that we can use CHF 11S in systems that require P/S fluid but we could not use PS fluid in systems that require CHF 11S.
 

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1995 E320 Wagon, 2002 S430
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Discussion Starter #11
Lots of really good info has come forward on this thread -- thanks for posting that TB.
 
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