[W126 Coupe] tranny fluid

[Camran Nassiri]

Steve- I'd say amen to that.  Not draining the converter is like taking a 1/2 bath, or only draining half of your motor oil.
Camran


From: stevenlemberg at sbcglobal.netTo: mbcoupes at mbcoupes.comDate: Wed, 4 Apr 2007 16:29:01 -0700Subject: Re: [W126 Coupe] tranny fluid



All Mercedes transmissions except the electronic versions of the newer automatics use Dextron or it's replacement.    The four speed automatics all use this fluid as do the manual gear boxes.
 
As for not draining the converter, I don't see the point.    The manufacture added a drain because they intended to have the converter drained when a service was performed.      Draining the pan alone will only remove about half the changeable fluid.     The converter drives the front pump on all automatic transmissions and regardless of the fluid level inside the converter the pump provides hydraulic pressure and lubrication at once.     The converter is filled within a few seconds of starting the car and no damage is caused.     If the converter did not have fluid the car would not move.    The front pump is driven off the converter body firmly bolted to the flex plate, the center shaft is driven by the stator/rotor and this what drive the input shaft of the transmission.     There is nothing in any of this that would cause harm or wear to the transmission by draining the torque converter and by not draining it you are not doing a full transmission service, merely changing the filter and part of the fluid.     
 
Steve 

----- Original Message ----- 
From: Richard Hogarth 
To: 'Mercedes Coupes Mailing Lists' 
Sent: Wednesday, April 04, 2007 3:55 PM
Subject: Re: [W126 Coupe] tranny fluid


Gary, 
I was thinking about that too. 
There are people who swear by Dextron III and have never had a problem and then there are those people who
Say that they had problems with Dex III that vanished when they switched to MB Trannie fluid. 
Consider also that an automatic from an 86 is not the same internally as an automatic from a 91. 
I also would like to know the differences in lubricity, viscosity, temperature expansion and whatever other specs 
Pertain to these fluids. 
I have a ’91. I switched to Dex III at 130,000 miles and I didn’t notice any performance difference.
I also don’t drain the torque converter when changing trannie fluid. 
In every trannie fluid change that I have done on many vehicles, GM, Ford, to foreign, draining the torque converter has always seemed to lead to problems for me. I think that the bearings and seals in the torque converter don’t get lubricated properly for too long a time when the converter gets drained. The torque converter also acts as the only oil pump in the trannie. If it ain’t full and pumping properly, there could be a lot of metal on metal wear until it fills properly and all of the air bleeds out. 
But hey, I’m only guessing. 
-RPH
 

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of GarySent: Wednesday, April 04, 2007 12:20 PMTo: mbcoupesSubject: [W126 Coupe] tranny fluid
 
seen alot of discussion about tranny's...was wondering what is the correct fluid?



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