C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

For those who have flushed their trans!

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Old Apr 21, 2011 | 03:48 AM
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For those who have flushed their trans!

I'd like to flush my trans (722.6) this weekend and I have looked at all of the info found here but I do have a few questions!

After you change your filter, and put the trans pan back on do you fill the now missing 4 or so qts of fluid through the trans dip stick tube? Or is there a filler bolt on the side of the transmission? I read on 1 diy that stated that the filler is on the back of the engine.

And while you are draining the 2-3 qts of fluid at a time using the clear hose, are you re-filling those 2 quarts through the trans dipstick tube?

And last, when you bolt the pan back on, is there a sequence for which bolts get tightened down first and do the need to be tightend with a torqe wrench?

Sorry to bother you with these questions, any help would be much appreciated!
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Old Apr 21, 2011 | 06:44 AM
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Fill through dipstick tube.

See torque order.

Attached Thumbnails For those who have flushed their trans!-trans_pan_torque.jpg  
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Old Apr 21, 2011 | 06:52 AM
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https://mbworld.org/forums/attachmen...0flush1-1-.pdf

https://mbworld.org/forums/attachmen...0flush2-1-.pdf
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Old Apr 21, 2011 | 05:32 PM
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You are the best my friend, thanks!!!
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Old Apr 21, 2011 | 05:58 PM
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Drain, or pump, then fill, repeat repeat repeat.
Not at the same time.
Fill through the dipstick hole.
Put in exactly what you take out amount wise.
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Old Apr 21, 2011 | 06:01 PM
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thank you kind sir!

Funny thing, I just brought everything home from my shop to do the flush. The Trans fluid i bought is pink/red, but when I used the tool to check my fluid level, the fluid on the stick is a clear color. The great news is that it is super clean, but I wondering if it was filled wit the wrong fluid?
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Old Apr 21, 2011 | 08:38 PM
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Does anyone know the total quantity of oil which is in the pan ? ie the amount drained + residue in pan.

I see total oil added during flush is 14 litres & total drained is 12 .Instructions state 2.5 litres in pan after draining !

What I am getting round too is that Glyns flush 1 instructions state :- If transmission oil is burnt or beading abrasion it will be necessary to flush the oil cooler lines and oil cooler to
ensure adequate cooling efficiency:


My question is if the oil is in good condition why flush ?

Just remove the pan, clean ,replace the filter & gasket & refill with the same amount of oil which was in the pan.

Doing this at regular intervals should maintain the quality of the oil ?

I have maintained ZF transmissions in the past & this was the process. ie regular draining which maintained the clean oil colour.

Looking forward to your input. John.
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Old Apr 22, 2011 | 01:00 PM
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JC - no need to flush if fluid is good. It's just a pity that Benz removed the TC drain in 1999 from the 722.6. If you do a sump drop & filter change (no flush) your refill will be approx 4 litres. (Remember to clean the pan magnet)

Check your car for a TC drain plug. It was put back on the 722.9 in 2007. If you buy a new TC for a 722.6 now it has a drain. Your W204 diesel might??? have a drain.

Last edited by Glyn M Ruck; Apr 22, 2011 at 01:02 PM.
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Old Apr 22, 2011 | 05:03 PM
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Thank you Glyn for the refill figure.

I have looked, no TC drain unfortunately.
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