2006 CLK350 POWER STEERING FLUID FLUSH - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 11-11-2012, 12:33 PM Thread Starter
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2006 CLK350 POWER STEERING FLUID FLUSH

I am about to do my first steering fluid flush.
I bought 2 liters of Pentosine CHF11S (green bottle and green fluid)
I plan to use the turkey baster method.
[ Suck up old fluid from reservoir. fill up with new fluid. Turn the engine on. turn several times the steering wheel to left then to right til it locks. turn off the engine ]
Repeat all steps until I use the 2 liters.

I am aware of the other method where you disconnect the reservoir return hose (the one that fills the reservoir not the one that suck up fluid out of it). you start the car and keep filling the reservoir as fluid is drain through the hose. try to maintain constant level. Fluid should never drain completely from reservoir otherwise air will go in the steering circuit.

my questions:
- the current fluid in PS reservoir is light brownish almost yellow. the previous owner used to service the car at the MB dealer. I assume it's the original MB PS fluid. Is it safe to mix it with the Pentosine CHF11S? yellow fluid mixed with green fluid.
- what is the best/easiest method between the 2 ? Do you know any better method to flush?
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post #2 of 31 (permalink) Old 11-11-2012, 01:17 PM
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It probably started out as green originally, but it does get contaminated with use. Mine is also sort of a yellowish brown, too. My understanding is the Pentosin is the OEM supplier.

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post #3 of 31 (permalink) Old 12-17-2014, 12:36 PM
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http://www.amazon.com/Pentosin-CHF-Synthetic-Hydraulic-Fluid/dp/B002WTHW26

This is what we want correct?

Thanks,
-Nigel
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post #4 of 31 (permalink) Old 12-17-2014, 04:53 PM
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Steering fluid flush?
What is the recommended schedule to change this fluid?
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post #5 of 31 (permalink) Old 12-17-2014, 07:07 PM
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That's it, Nigel!

As for the PS fluid flush schedule, there really isn't one. It is simply to be checked and topped-up at each B service. However, some people like to do some preventative fluid changes.

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post #6 of 31 (permalink) Old 12-18-2014, 03:25 AM
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In my experience the MB original fluid is yellow when new and becomes yellowy brown when old.
Febi Bilstein fluid is also a genuine MB fluid. Bevo spec is 236.3 .MB part no is A0009898803.
I change it about once every three years. I think this helps prevent leaks or other malfunctions in the system.
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post #7 of 31 (permalink) Old 12-30-2014, 02:49 PM
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Hi guys, I drive a CLK320 2004 (W209). About the power steering, I looked into the reservoir and didn't see any filter. Is there a filter we should change when flushing the hydraulic fluid?
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post #8 of 31 (permalink) Old 12-30-2014, 04:23 PM
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No,no filter to worry about.
Remember the car companies don't even have ps fluid changes in their maintenance schedule,so only the cars maintained by their diligent owners ever get new fluid.
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post #9 of 31 (permalink) Old 12-31-2014, 11:31 AM
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Thanks for the info. This is how I would flush the power steering. Not sure if anyone out there did this way. Let me know if you see anything wrong with that: 1) Raise the front of the car and use a turkey baster to remove as much fluid as I can from the reservoir. 2) I would then fill it up with new fluid. 3) Disconnect the low pressure hose near the reservoir where that hose connects to a metal pipe. 4) Connect a short hose to that metal pipe and the other end of the hose to a jar to collect the old fluid. 5) Crank the car for a few seconds, so some old fluid come up from the bottom. 6) Fill the reservoir again with new fluid. 7) Repeat step 5 until most old fluid (about 1 quarter) is collected in the jar. I will be using Pentosin CHF 11s which is green color. My old fluid is like amber color. So, I would see the difference in the collection jar.
Comments are welcome.
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post #10 of 31 (permalink) Old 01-01-2015, 01:09 PM
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Hi guys, I'm afraid I'm in trouble. I just replaced the power steering fluid of my Mercedes CLK320 using the turkey baster method by sucking the old fluid, turning the wheels lock to lock, wheels off the ground, refilling the reservoir several times until most fluid were replaced. I used the recommended fluid replacement, Pentosin CHF 11s, After turning the engine on and off for a second or so, I rechecked the fluid level to find it was full of bubbles, like foaming. I repeated the process turning the wheels lock to lock, turned the car on and off again and it is still foaming. When turning the wheels with engine on (for a few seconds) heard a groaning sound. I stopped at that point. I am concern to continue and cannot even drive the car until I'm sure I didn't do any damage. Can someone help me?
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