Trans flush recommendations?

[PanzerSD]

Are transmission flushes recommended for Mercedes transmissions? I've read posts where there was some damage done afterward as a result of a flush.
a recommended method or chemicals?

[alabbasi]

I'm not sure what you mean by flush. I drain the transmission fluid from the transmission and the torque converter and refill with Dextron III (no particular brand) and i've never had trouble, On the 722.3 cars, I've sometimes had problems getting the rubber seal on the transmission pan to seal with after market seals so it may be worth buying a genuine seal,

[Mike D]

No "power flush" if that's what you're asking. There are some machines which use the pressure generated by the pump itself and they filter and "re-cycle" the fluid. You still need to change your filter so I don't know what benefit they could have.

A transmission fluid change and filter is all you should ever need. No extra chemicals.

[JMURiz]

Are you talking about a BG products trans flush? My local MB dealer advertises BG stuff, so I'm guessing they do the trans and coolant flushes.

[engatwork]

If you will change it and the filter about every 30k miles it will go for a long, long time.

[PanzerSD]

I've seen them hook it up to a machine and flush. new fluid and filter in the end...?

[compu_85]

Because you can drain the torque converter on the 722.1 you really don't need to use a flushing machine. By just doing a normal service you get most of the fluid changed. On most autoboxes you can't drain the torque converter so when you do a service you only change a fraction of it.

-J

[Tomguy]

The flush machines are needed for vehicles like my 300M - no torque converter drain plug, but you can work around it. For example, drain the pan and replace the filter, put in fresh fluid, cut the line to the trans cooler and put the outlet in a jar. Put the inlet in a fresh can of ATF. Start the car & run until clear fluid comes out the draining end, then splice or replace the line.

The machines typically just take the place of starting the engine in the process, and use pressure. It can damage seals in the trans, because the inlet is usually pulling versus being pushed.

[engatwork]

drain the pan and replace the filter, put in fresh fluid, cut the line to the trans cooler and put the outlet in a jar. Put the inlet in a fresh can of ATF. Start the car & run until clear fluid comes out the draining end, then splice or replace the line.

That is a good idea.

[PanzerSD]

Originally Posted by Tomguy

The flush machines are needed for vehicles like my 300M - no torque converter drain plug, but you can work around it. For example, drain the pan and replace the filter, put in fresh fluid, cut the line to the trans cooler and put the outlet in a jar. Put the inlet in a fresh can of ATF. Start the car & run until clear fluid comes out the draining end, then splice or replace the line.

The machines typically just take the place of starting the engine in the process, and use pressure. It can damage seals in the trans, because the inlet is usually pulling versus being pushed.

that is what I was wary of...I think the change will suffice

[compu_85]

Other flush machines are just a fancy bucket... the trans' pump does the work and the "machine" just provides clean fluid in one line and collects the old fluid coming out of the other.

-J

[PanzerSD]

Originally Posted by compu_85

Other flush machines are just a fancy bucket... the trans' pump does the work and the "machine" just provides clean fluid in one line and collects the old fluid coming out of the other.

-J

like changing the fluid, but without cracking the seal on the pan, changing the filter, or 40% of the old fluid...lol

[compu_85]

It does get all the old fluid, but you are right, the filter is never touched.

-J

[bwostosh]

Open it up and get the majority, then wait for the remainder.
I let it (converter and valve area) drain for a week.

Observe what comes out for clues.

Most interestingly, the last one I did had clouded oil, (not burnt color) and I put it into a test tube for further settling, no particles!
The detergent factor must keep the stuff in suspension.

Write the date on the new filter with a sharpie for the next time next guy's reference.

[Tony H]

I thought all the "flush" machines did was exchange the fluid. On our Odyssey the manual says to change the fluid 3 times with a short run time between changes to get all the old fluid out. Each fill takes about 7 quarts so there is quite a bit of fluid that cannot just be drained out.