C220 W204 Gearbox fluid change

[Bruiserray]

7G Tronic Plus ATF Change & Service - E Class 2013

www.benzworld.org

Wow. That's very detailed! Not sure it completely helps though tbh as mines a different gearbox so the detail is a bit lost. Again being very honest, I might work on the basis of a good (quality) oil change. Using new seals, bolts etc as you suggest of course. Without complications of the TC. Now and again sooner rather than later. So only say 70 or 80% of the fluid is changed now, but do it again in 15/20k and repeat. Stay on top of it. Thanks again.

 

[WilliamParsons]

I keep seeing that - drain the TC, but how?......

To drain the transfer case (TC) fluid in your Mercedes-Benz C350e or similar vehicle:

1. Locate the TC drain plug on the bottom of the transfer case.
2. Place a drain pan underneath.
3. Remove the drain plug.
4. Allow the old fluid to drain completely.
5. Replace the drain plug and gasket (if applicable).
6. Refill the transfer case with the appropriate fluid through the fill plug on the side.

Always consult your vehicle's owner's manual and follow manufacturer recommendations for specific instructions and fluid specifications.

 

[ToeKnee]

To drain the transfer case (TC) fluid in your Mercedes-Benz C350e or similar vehicle:

1. Locate the TC drain plug on the bottom of the transfer case.
2. Place a drain pan underneath.
3. Remove the drain plug.
4. Allow the old fluid to drain completely.
5. Replace the drain plug and gasket (if applicable).
6. Refill the transfer case with the appropriate fluid through the fill plug on the side.

Always consult your vehicle's owner's manual and follow manufacturer recommendations for specific instructions and fluid specifications.

Wrong again......

 

[Bellow]

So only say 70 or 80% of the fluid is changed now, but do it again in 15/20k and repeat. Stay on top of it. Thanks again.

Half - at best.
Given the rigmarole of an MB ATF change (unnecessarily complicated fill and temp procedures) draining the TC (especially with a drain plug as opposed to having to pump it out) is the easy part. Do it right, do it once.

 

[Bruiserray]

To drain the transfer case (TC) fluid in your Mercedes-Benz C350e or similar vehicle:

1. Locate the TC drain plug on the bottom of the transfer case.
2. Place a drain pan underneath.
3. Remove the drain plug.
4. Allow the old fluid to drain completely.
5. Replace the drain plug and gasket (if applicable).
6. Refill the transfer case with the appropriate fluid through the fill plug on the side.

Always consult your vehicle's owner's manual and follow manufacturer recommendations for specific instructions and fluid specifications.

You know the TC is the torque converter - right?

 

[Bruiserray]

Wrong again......

Perhaps you can enlighten me / us with the correct information then?

 

[Bruiserray]

Half - at best.
Given the rigmarole of an MB ATF change (unnecessarily complicated fill and temp procedures) draining the TC (especially with a drain plug as opposed to having to pump it out) is the easy part. Do it right, do it once.

Again, as per message to ToeKnee - can you enlighten how you actually do it then - for the correct gearbox - the 722.6 5g (not 7g). Is there a drain plug? Or some procedure to do to get (as much as possble) fluid out of the TC?

How do you 'Do it right' (and of course it needs doing more than once in its lifetime btw!) And, with the greatest respect, I would beg to differ that not doing it at all is far worse than at least changing as much of it that you can (and then doing it again (much) sooner than needed).

Looking forward to hearing back. Thanks in advance.

 

[Bellow]

Again, as per message to ToeKnee - can you enlighten how you actually do it then - for the correct gearbox - the 722.6 5g (not 7g). Is there a drain plug? Or some procedure to do to get (as much as possble) fluid out of the TC?

How do you 'Do it right' (and of course it needs doing more than once in its lifetime btw!) And, with the greatest respect, I would beg to differ that not doing it at all is far worse than at least changing as much of it that you can (and then doing it again (much) sooner than needed).

Looking forward to hearing back. Thanks in advance.

If the TC has a drain plug - then obvious. If not, it has to be pumped by running the engine. I can only tell you how I did mine (GM 4L80E - not MB). I drained the pan with Pela vacuum pump via the dipstick (drain from plug or pan removal if no dipstick). Add the same quantity of ATF as removed. Disconnect a line to or from the cooler and start engine until either, the fluid comes through looking fresh or, an amount equal to the 'total fill after rebuild quantity' minus ATF previously removed has been ejected. This may involve stopping the engine and refilling pan. Refill pan to correct level.
The MB procedure is more involved (and a thermostat may intrude on flow to the cooler) but the basics are the same for all auto transmissions. Just get the detail sorted out beforehand. As said previously, the faff is what MB introduced and has to be dealt with every time ATF is removed. Drain the TC and there is clean ATF throughout (you wouldn't half change any other fluid) and you double the mileage before having to do it again. Anything less is sloppy IMO. Better than 'not doing it all' - but that isn't a realistic option so can be discarded.

 

[ToeKnee]

Perhaps you can enlighten me / us with the correct information then?

I could yes, but I said "wrong again" as the chat ai bot assumed that TC meant transfer case and gave instructions for that whereas the op was talking about the torque converter. Of course, if you'd read the whole thread you'd have realised that.

 

[philnewmerc]

Simple answer: in most Mercs post mid-1990s with no TC drain you can only change about 1/2 the fluid. It's also the case that Merc often state it is sealed for life, or one change at 37,000 miles then sealed for life. Most sensible people reckon to change the ATF every 50-70k miles. So, if you can only change 1/2 of it either accept this is not perfect but better than nothing, or double the change frequency to e.g. every 30k miles or so, or every 3rd or 4th engine oil change.

 

[Petrol Pete]

As said , many , mine included have no drain plug on the TC ,dumb a$$ idea but no doubt insisted on by the bean counters when they hilariously decided that the transmission was sealed for life.

The life of the warranty period no doubt.

 

[W1ghty]

Again, as per message to ToeKnee - can you enlighten how you actually do it then - for the correct gearbox - the 722.6 5g (not 7g). Is there a drain plug? Or some procedure to do to get (as much as possble) fluid out of the TC?

How do you 'Do it right' (and of course it needs doing more than once in its lifetime btw!) And, with the greatest respect, I would beg to differ that not doing it at all is far worse than at least changing as much of it that you can (and then doing it again (much) sooner than needed).

Looking forward to hearing back. Thanks in advance.

Have a look on YouTube , loads there if you search 722.6 or Mercedes 5g gearbox etc …
On my CLK 5g , I change the filter every 30k miles ish . There is a tube for the transmission ATF in the engine bay so it’s easy to fill .
Buy a 722.6 dipstick from eBay
There is a sump drain plug for the gearbox , so if I change the filter I drain via the sump plug . But every year for £30 of ATF I use a Pela suction device to empty 3.5L of ATF via the transmission engine bay tube .

 

[Shadgrind]

Plenty of YouTube videos on the subject, may just put you off, I have all the parts, including new bolts and upgraded sump pan with the green tube and the fluid, also got the screw in refilling adapter