The issue that you allude to that is somewhat of an urban myth is related to 
severely worn transmissions that have a large amount of friction material in 
suspension. That is, if the transmission is reliant on the remains of the 
friction material in the fluid to provide some benefit to the clutches actually 
engaging, if removed, will render the transmission non-functional or marginal 
at best.

This is a really severe example and highly unlikely to occur under nearly any 
circumstances.  However, it's the basis for the fear mongering over the use of 
commercial flushing machines.

Flushing your transmission is no different that cracking open a cooler line and 
letting it pump fluid out while someone pours new fluid in.  I personally 
wouldn't do it for fear of running the transmission dry, but it can be done. 
While I'm not terribly keen about the idea, I'll be using the drain and replace 
approach to the E320 soon, as I just picked up a filter and pan seal from the 
dealer today.  You can do this 2-3 times over a month or less and you will have 
replaced the better part of the fluid.

And I definitely don't prescribe to the "sealed for life" mentality.


> On Aug 8, 2017, at 1:02 PM, Donald Snook via Mercedes <> 
> wrote:
> Speaking of transmission fluid and servicing of them, anyone else done a 
> transmission flush with the machines that shops have now?   I remember when 
> they first came out there was a machine that allegedly pushed the fluid in 
> reverse to replace it.   When I worked at the dealership, we had a machine 
> that hooked into the cooler lines and cycled a full 14 quarts through the 
> transmission -- but not in reverse.  It was the normal direction of flow -- 
> whatever that means.  But, it worked great.  Years later, I had it done on a 
> couple of my wife's cars at another shop.   In fact, I had it done on Craigs 
> 1990 300D when I owned it.  I have never had any problems with a car after 
> doing the flush.  But, I have heard stories (possibly urban legends) that it 
> has caused transmissions to fail.  I'm asking because I am considering trying 
> it on my older BMW.  BUT, BMW transmissions are not technically serviceable.  
> There is no dipstick and BMW says it is a sealed system and should not be 
> serviced be
 cause it is built to last a lifetime.  I have never had a transmission problem 
on any of the 5 BMWs I have had.  So, maybe I shouldn't tempt fate.  
> Don Snook 
> -----Original Message-----
> From: Max Dillon [] 
> Sent: Tuesday, August 08, 2017 1:02 AM
> To: Mercedes Discussion List <>
> Subject: Re: [MBZ] An oil question
> Correct, I spent hours digging into the official MB oil sheets, and Dex III 
> is the answer.  One can spend more (Mobil 1, Febi, Fuchs, etc) if desired, no 
> harm except your wallet.  Personally I use the Febi fluid now, I used M1 for 
> the first change though.
> -- 
> Max Dillon
> Charleston SC
> '87 300TD
> '95 E300
>> On August 7, 2017 11:23:36 PM EDT, "Kaleb C. Striplin via Mercedes" 
>> <> wrote:
>> I'm sure it's fine too. There is noting special required
>> Sent from my iPhone
>>> On Aug 7, 2017, at 10:18 PM, Craig via Mercedes
>> <> wrote:
>>> On Mon, 7 Aug 2017 22:00:50 -0500 "Kaleb C. Striplin via Mercedes"
>>> <> wrote:
>>>> Whatever the current dextron is, or that maxlife synthetic in the
>> red
>>>> bottle at Walmart 
>>> Not Mobil1 ATF?
>>> Craig
>>> _______________________________________


To search list archives

To Unsubscribe or change delivery options go to:

Reply via email to