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Old 04-26-2016, 02:16 PM
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Join Date: May 2008
Posts: 136
topping off rear differential w210

My rear differential on my 1999 e300td has somewhat of a leak. How difficult is it to check the fluid level, and top off if necessary? Any advice/experiences doing so are appreciated. Also, any recommendations on a particular differential/gear oil to use?
1999 E300TD
Wilmington, NC USA
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Old 04-26-2016, 03:39 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,969
There is a fill plug on one side of the differential. It is a 17 mm allen head IIRC. Remove plug and add fluid till it runs out. After it stops running out reinstall plug. I typically use 75/90W synthetic different lube.
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Old 04-27-2016, 11:59 AM
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Join Date: Nov 2010
Location: TX
Posts: 3,388
as engatwork said - use the filler plug, its exactly like the W124 (driver side of the diff).

The W210 were filled with regular SAE85W90 dino gear oil (the smelliest and thickest kind you will ever come across). If your diff is leaking then dont use a synthetic in there as it will super clean everything out and may make the leak worse.

get some cheap house brand gear oil from any store and top it up. Once you fix your leaks then fill up with synthetic.
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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Old 04-27-2016, 03:12 PM
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Join Date: Sep 2005
Location: Miami, FL
Posts: 407
I'd get some Lubro Moly 235.0 spec 85w90 gear oil, that should be what was originally spec'd in that car. It's non-synthetic but it is what's approved by MBZ for use in your diff. I used it in both my Benzes, including my W208 CLK430. I found it locally pretty reasonably-priced. I'm just a stickler for approved MB fluids.

Once you get the leak fixed, drain and fill with that same gear oil and motor happily.
1995 E300 Diesel
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