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2009 c300 transmission service question

     
Old Apr 28, 2017 | 01:48 PM
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2009 c300
2009 c300 transmission service question
Hello I have a 2009 c300 and havent done any transmission service since the car was bought. I am current at 109k miles and its still running, it seems that its sluggish. So the question is should I flush my transmission fluid or change it? Ive heard that flushing a transmission that hasnt been changed can make it faulty and problems will occur. Any thoughts?
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Old Apr 28, 2017 | 05:14 PM
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1992 MB 190E, 2016 MB C300
An indy MB tech that I trust says don't flush. Drain transmission and TC and change filter. Refill.
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Old Apr 28, 2017 | 05:50 PM
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Originally Posted by dennish
An indy MB tech that I trust says don't flush. Drain transmission and TC and change filter. Refill.

Most MB dealers don't properly flush either.
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Old Apr 28, 2017 | 09:28 PM
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Originally Posted by Colin G
Most MB dealers don't properly flush either.
MB dealers should follow the WIS. In the WIS there is no mention for a "flush", just a drain and fill
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Old May 7, 2017 | 01:00 AM
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I don't think I ever heard a reputable source recommend a flush on any AT. Drain Fill & Swap Filter
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Old May 7, 2017 | 03:13 AM
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Originally Posted by C300Matic
I don't think I ever heard a reputable source recommend a flush on any AT. Drain Fill & Swap Filter
What would you recommend when you have no drain plug on the TC?
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Old May 7, 2017 | 08:21 AM
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Originally Posted by Carsy
What would you recommend when you have no drain plug on the TC?

Me personally - not worry about it

If it was a car I was trying to meticulously maintain, I'd drain & fill the ATF every 30k or so.
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Old May 7, 2017 | 07:44 PM
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What I do on the 2001 e430(no TC plug) is drain and refill the pan. After about 1K, I drain again. This time dropping the pan and changing the filter. Refill measuring with dipstick @ 80 C.(both times). I think this gets most of the old fluid changed.
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Old May 7, 2017 | 07:48 PM
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Originally Posted by Carsy
What would you recommend when you have no drain plug on the TC?
Drain and fill a few times. NOT a flush. Those are two separate things.
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Old May 8, 2017 | 10:33 PM
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The 722.9 transmission TC should have a separate drain plug, usually have to rotate the TC for access. Should take 2L, plus the approx. 7L for the drive section. Here's the Sticky:

https://mbworld.org/forums/c-class-w...ce-thread.html
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Old May 9, 2017 | 06:31 AM
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Originally Posted by Acapulco Bill
The 722.9 transmission TC should have a separate drain plug, usually have to rotate the TC for access. Should take 2L, plus the approx. 7L for the drive section. Here's the Sticky:

https://mbworld.org/forums/c-class-w...ce-thread.html
Can confirm it's around 2L. Just had mine done. Cheers!
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