BenzWorld Junior Member
Date registered: Feb 2009
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Thanks. The references were helpful but I'm still confused. My goal is to get the transmission fluid change done right and be sure it was. I use dealers for lots of things but this seems to be an area where they are doing a variety of things which may not be the right things to do.
Part of my problem is that it seems the dealers don't really change the fluid, they drop the pan, change the filter, and replace whatever fluid was in the pan. This doesn't seem like the right thing to do and can't be all that hard for a DIY.
If the desire is to change more of the fluid then it gets harder. Here is seems that the dealers use the BG system and often use the BG chemicals. Is this approved by MB? It isn't clear but seems unlikely. If they do it this way, they don't change the filter.
So, if you're anal about these sorts of things (I am), how does one get the fluid out and have the filter changed? It isn't clear that the dealers have this figured out so DIY looks like the best way to get it done. (If I'm wrong about the dealers, I'm certainly willing to go that way.)
So, if I want to do it myself, how is it done without all the expensive MB special equipment? There was a mention of starting the car and letting the transmission pump the fluid out of one of the cooling hoses. If one did this, the fluid needs to be replaced. Assenmacher makes the adapter needed for the 722.9 transmission to add fluid (and has a kit that includes it and a pump). So, will pumping the fluid out via the hose and pumping new fluid in via the Assenmacher kit work? If so, if I measure what comes out and pump that amount in, is that OK? It seems to me that this should work, but I'm not sure.
Some of the links talk about measuring the fluid at specific temperatures using the MB Start Diagnostic system. If this is needed, can't that be done via a non-contact external measurement rather than using the Star Diagnostics and computer? How critical is it to monitor the temp if about the right amount of fluid is replaced?
I hope this helps explain my quandary.
Thanks again for any help.