Darel

What is the reality of servicing the tranny on my '14 E350 at home? I have heard of guys doing it on here, and maybe not being able to drain the torque converter fully, but then I've also heard that for some reason in order to do it you need to plug in to the STAR computer at the dealer or something? Is this going to be the one thing I need ot pay the dealer to do for me or can you actually service the transmission on your own? Fluid and filter change, that is.

If you CAN do it yourself, does anyone have a nice writeup on how to do it, like that one that came out for spark plug changes a little while ago?

I do have the WIS at home but for some reason my database got corrupted and the only thing that works is the EPC on it.

Thanks,
Darel

Abrown3mtg

I've done it one a lift in a shop and had a star computer. The computer measures the internal temperature of the fluid which determines when to fill/drain. It's not hard but I loath the refilling procedure. It's sketchy vs a standard dipstick fill....

change the tranny mount when you do it. I wish I'd done so myself

Darel

OK, so there is a drain then, and access to change the filter? You just don't know when to stop filling? But you've got a dipstick?

Mud

I do most work myself but in my case decided to pay $325 for dealer to do 30k fluid and filter on my 4matic. Reason was it's still in ELW and I wanted clear documentation of service for what I consider a complicated and possibly trouble prone system. Plus its a generally fiddly job. I'll do it again at 60k as dealer service.
I do my own oil changes though - one can say the engine is of course complicated too, but that procedure is more straightforward and I also get an oil analysis done annually, plus hang on to receipts.

Darel

$325 isn't too bad. I'll spring for the dealer to do that one then. Thanks!

kajtek1

I am getting ready to do it on my 2 cars and here are the observations I gather.
- drop the pan and wipe it clean with no lint- rag. I like to blow it off at the end with air
-measure the drained ATF so you have idea how much to refill. Suppose MB says 6l, but usually 5 is all it takes
-consider cleaning the filters on valves tips. You will find video on youtube
- the proper procedure is to fill up (14 mm adapter ?) till oil drips, take the car for longer drive to get transmission up to 80C, open the plug and let the exceed drip. (engine running)
BTW the car with 182,000 miles had the transmission service at 40k and that was all MB recommends for 2008 model. Still runs perfect.

Mud

Darel check with the dealer first, seems prices vary on this service. Be sure that it's a fluid AND filter change and not just a fluid drain and fill. Good luck!

Oda112

It shouldn't be too difficult, I've done it a few months ago. I suggest buying one of these https://www.ecstuning.com/b-schwaben.../007311sch01a/ ( ) to make the job easier. It comes with all the adapters needed, and you can use it for bake bleeding too (it also has adapters for VW, BMW, etc.).
There's a video I found useful on youtube : And of course there's a thread here, it's for the W204 but it should work for the W212 as well : https://mbworld.org/forums/c-class-w...ce-thread.html
There are plenty of kits available online, most of them come with everything you could need (filter, oil pan gasket, bolts, TC bolt if you do the TC drain, the oil level tube). If you have the 7G+ with A89 (reduced friction), your oil will be 236.15 Spec ( ATF 134 FE OE ). You will have the A89 code if your gearbox is newer than 6/21/2010.
When I did mine I left the TC and gearbox drain overnight and got slightly more than 9.2 l out of the transmission ( I have the 4matic model and that holds up to 9.7 l of fluid).
For filling it up, I used a multimeter with a temperature probe, which I stuck on the belly of the tranny pan and kept and eye out for that magic 45C temp. If I was to do it again, I'd put all the fluid in all at once (maybe 0.2 to 0.4 l more than what I got out) and once I see that 45C I'd drain the excess and call it a day.
Overall cost was less than 300$ and I got a bonus tool.
Good luck if you decide to do it!

The Critic