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MB: ATF every 40,000/4 years whichever comes first, transfer case proactively the same.
Copy thank you.
I dont see in MB records this ever done to my car even though it was well cared for. Unless it was in one of the service A or B or C ones.
Is it safe to do in a 108 k mile car? It drives perfect as we speak.
The transfer case is integrated into the transmission case. It shares fluid. Therefore, a trans service is a transfer case service.
The best course of action is to upgrade to the A89 pan, green overflow tube and filter. There is a bulletin for this. Evidently it improves oiling for something related to the transfer case. You must still use the stock fluid (236.14, red stuff) and NOT the thinner A89 stuff (blue 236.15), despite using the pan, tube and filter. It is possible you already have these items. There is a way to visually identify.
That's not a transfer case. It's a differential. That nomenclature is likely an aberration of a weird German to English translation.
To be clear, is the OP asking about front diff service (which is possible and recommended; I've done it), or "transfer case" (which is part of the transmission)?
Thanks but that's what I tried to clarify I wasn't emphasizing transfer case but rather 'differential' inclusive of diagram. Guess one word & picture needed more splaining.
tbilisi79 of course you can replace fluid to both f & r differentials but my reasoning for suggesting front only is because of minimal complaints for rear differential noises/performance if this makes sense.
I would highly recommend servicing the front diff. I think a major failure mode is simply running low on fluid and it chews itself up. You drain and fill from the bottom and must pump in the correct volume of fluid.
The transfer case is integrated into the transmission case. It shares fluid. Therefore, a trans service is a transfer case service.
The best course of action is to upgrade to the A89 pan, green overflow tube and filter. There is a bulletin for this. Evidently it improves oiling for something related to the transfer case. You must still use the stock fluid (236.14, red stuff) and NOT the thinner A89 stuff (blue 236.15), despite using the pan, tube and filter. It is possible you already have these items. There is a way to visually identify.
Haven't located bulletin perhaps kevm14 could post it. Here is what I have on hand. Claims only applicable to 722.901, but ISPUSA shows both original & updated version for 221.186 (4matic) which has 722.961, and VIN specific 4matic shows original. I would confirm correct part # with local dealer.
I can't find it either. But, the kit FCP Euro sells does convert to the A89 pan, green tube (goes with pan) and the updated BEST filter for the 722.9. Seems like a good idea to me but I guess I'd always be open to more information.
I have posted a question on FCP Euro’s blog asking how they are certain that a filter designed for a certain viscosity fluid works equally well with a different viscosity fluid. It’s been months and there is no answer.
I would think there is a reason Mercedes specified a different filter rather than continuing to use the same part when they changed the fluid spec.
so far FCP is the single source available describing (and recommending) this retrofit.
on paper it sounds interesting, but I’d like to see info directly from Mercedes.
I don't have any personal concerns that the 50 micron filter is just somehow incompatible with the red fluid. My understanding is the filter was upgraded to improve, uh, filtering as part of the A89 transmission update. They also changed the fluid to a lower viscosity fluid which I assume was mainly for fuel economy (but required a redesign of clutch material and not sure what else). This created a convenient opportunity to improve filtration (which required a pan redesign). But again my read on the filter was that these transmissions are susceptible to junk in the fluid clogging things like solenoid ports, and the 4Matic transfer case can also put junk into the fluid so the finer filter is a really good insurance policy against those issues, and it works with the pre-A89 transmissions. But yes, I would like to see Mercedes back this. I can speculate (it's free) that putting an A89 pan on an older transmission can cause confusion since I have read a LOT of threads where people identify their updated transmission from just the pan (when they should actually be looking at the A89 option code). The pan and filter are a matched pair and since the pan is different, it also requires the green tube. But the transmission case itself is the same so that's why, in my view, there is nothing wrong with this upgrade. I've done thousands of miles since doing the update...
making it up - I thought it had higher fluid quantity - but it reads its bigger to accommodate the larger more sophisticated filter - but its a good point, if the flow isn't enough that would be bad news
the other later fluid is def not compatible with earlier boxes
The best course of action is to upgrade to the A89 pan, green overflow tube and filter. There is a bulletin for this.
I checked with the MB WIS and there is no bulletin for that. On the contrary, in the document describing the changes in oil pan, filter and overflow tube made in 2010, Mercedes explicitly states that the two versions must NOT be interchanged (in neither direction). This, of course, is Mercedes' view of the world. It may work regardless, or not.
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