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Mercedes W210 E320 wagon
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Discussion Starter #1
I’ve done this service a week ago and now I just decided to write up a little bit about details. I would like to say Thank you to G-AMG for his helpful post on this forum:
Photo Diy- Rear Differential Oil Change.

Routine itself was very much the same, except I didn’t have a lift and used ramps and two sets of the jack stands for leveling the car.

The parts list:
RedLine Gear Oil 75W85 - 2qts.
A170 140 01 15 – flexible disk set.



Put car on rams then jack it up the car for middle engine jack point, and put pair of jack stands under front left and right jack points. Car should to be leveled.



We are ready to change a differential fluid.
Open diff filling cap (14mm hex socked). Be ready to catch small amount of fluid (I had very tiny oil stream from the hole).

Open diff drain cap. Drain old fluid. When it draining then you need to check and prepare caps to reuse. I cleaned then by Brake fluid, checked treads condition and then apply small amount of thread sealant on cap.

Put drain cap back, twisted it and finally tight it with torque 50Nm.

Pumped new differential oil to the differential

Put filling cap back, twisted and then finally tight it with same torque – 50Nm
For changing rear flex disk I had to jack up one read wheel. This is necessary for free drive shaft.
Switch your transmission to the Neutral and here we are ready to go.

Removed all old bolts, pried to front drive shaft, and replaced the flex disk.

Before then you tight new bolt ensure the washed and bolts are located properly.

Torque specification for bolts is 60Nm.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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Very nice!

Sorry for the silly questions, but how do you know which of the bolts go where? (ie. the black oxide ones vs. zinc coated)

Also, the 75W85 is a little on the "thin" side, do you think?

What is that blue thing-y on the end of your pump hose... some sort of "one-way valve"?
If so, that's nifty..
 

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Mercedes W210 E320 wagon
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Discussion Starter #3
Very nice!

Sorry for the silly questions, but how do you know which of the bolts go where? (ie. the black oxide ones vs. zinc coated)

Also, the 75W85 is a little on the "thin" side, do you think?

What is that blue thing-y on the end of your pump hose... some sort of "one-way valve"?
If so, that's nifty..
I choose 75W85 fluid viscosity only for one major reason. Genuine fluid has this viscosity number :).
Black bolts are little bit shorter then silver ones. When I put them in place they were kind of leveled together. This is back side picture.


Grey thing on the end of pump is plastic hook with cap. This is useful feature to manage oily mess.
 

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1972 MERCEDES 280 SE, 1984 MERCEDES 300 D, 1989 MERCEDES 300 SEL, 1998 MERCEDES E320 WAGON
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Did you mark the driveshaft relationship to the differential to make sure they are balanced?
 

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Mercedes W210 E320 wagon
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Discussion Starter #5
Did you mark the driveshaft relationship to the differential to make sure they are balanced?
No, I didn't. I thing it is not necessary. I didn't disassembled drive shaft itself. When I put new flex disk on shafts I just double checked that it fits for both sides of landing holes.
 

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2002 E320
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Any benefit from the flex disc change? Was there an original issue that prompted its change and now it's fixed? Thanks!
 

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Discussion Starter #8
Any benefit from the flex disc change? Was there an original issue that prompted its change and now it's fixed? Thanks!
This is my original rear flex disk after 174+k miles. You can see a lot of cracks around bolt holes. This is why I replaced it.
My next project is going to be R&R front lower control arms. Very same reason - rubber bushings are cracked there.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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I choose 75W85 fluid viscosity only for one major reason. Genuine fluid has this viscosity number :).
I always hate disagreeing with the Masters, but this is incorrect.

Here is sheet 231.1, which specifies "75W-90, or 90 Weight".

Redline 75W-90, actually, meets BOTH of these parameters.

Thanks for the clarification on the bolts, and your fancy hose hook....
 

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Discussion Starter #11
I'll replace the diff oil on next Spring season. I think thinner formula is OK for winter time :).
 

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Discussion Starter #12
G-AMG,
Take a look at this URL:
Universal hypoid gear oils (Specification 235.7)
Fuchs TITAN SINTOPOID FE 75W-85 Fuchs Petrolub AG, Mannheim/Deutschland
MB 235.7 FE-Hypoidgetriebeöl A 001 989 33 03 Daimler AG, Stuttgart/Deutschland
Mobilube FE 75W-85 Exxon Mobil Corporation, FAIRFAX, Virginia/USA
It looks like 75W85 is recommended viscosity for our diffs...
but in your document I see:
Rear axle (standard differential) 85 W>90, 90
I guess 75W85 will be OK as well as 85W90. :)
 

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1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
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This is my original rear flex disk after 174+k miles. You can see a lot of cracks around bolt holes. This is why I replaced it.
My next project is going to be R&R front lower control arms. Very same reason - rubber bushings are cracked there.
Based on this thread and especially this post, I checked my flex disk a little more closely than I usually do when doing a B service. Saw the beginnings of some tiny cracks at 140,000 miles. Made a note to myself to replace it at the next service, i.e. 150,000 miles.

Thanks.
 

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88 560SL - 01 C240 - 02 W210 4matic Wagon - W212 4matic wagon
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My 02 4matic station wagon has just about 80k on it and I noticed a little sloppiness in the drivetrain while in traffic. It was barely noticeable and only with rapid on off throttle movements. Since the car is still under warranty I mentioned it the last time it was in for service -- they replaced both discs.

MB service told me that the discs will often look to be OK but still give the symptoms I described -- so they are authorized to replace them. These were not at a point of failure - but changing them eliminated the slight "clunk"

Thanks for taking the time to post the pictures.
 

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2012 E350 :-) 2002 E320 (sold)
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Should the flex disc be replaced at some particular interval or how do you know it needs to be replaced? 2002 E320 w 97K miles
 

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there is no recommended replacement interval, but visually you can tell they need changing if there are cracks in the rubber. also drive line vibrations can be attributed to bad flex discs.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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G-AMG,


It looks like 75W85 is recommended viscosity for our diffs...
but in your document I see:

I guess 75W85 will be OK as well as 85W90. :)
Yes, Indeed... Like other MB publications I have seen.... a bit "Schizophrenic" and "Confusiating". I believe both should work...especially in your cooler climate.

Have you noticed any Auditory differences after switching to the synthetic?

G
 

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Discussion Starter #18
Have you noticed any Auditory differences after switching to the synthetic?

G
Old fluid was Synthetic RedLine 75W90. It was in differential more then 4 years. I don't see any difference yet ;).
 
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