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  #1  
Old 04-06-2021, 11:18 PM
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W140 Differential Gear Oil

1995 S500 - what is the part number for the correct differential gear oil for this vehicle?

For this vehicle, without limited slip, EPC shows two options:

a) 000 989 28 03 - 85W-90 (MB 235.0)

b) 000 583 09 04 - ATF diff gear oil (EPC lists this as an ATF; not certain that is correct)


Does 000 989 28 03 sub to 000 989 03 04 11 AOHW?

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  #2  
Old 04-06-2021, 11:39 PM
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Do you have limited slip diff in your car?
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  #3  
Old 04-07-2021, 06:10 AM
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I usually just run a synthetic 75W90 and let it go at that.
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  #4  
Old 04-08-2021, 01:45 PM
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I went through this fire drill back when my '88 190E 2.6 was less than a year old. I recall that MB recommended an axle fluid change early on. There was a list of approved oils in my owners documents. I searched high and lpw for a recommended Pennzoil product, but couldn't find it anywhere.

I finally called Pennzoil and they said that particular product was NOT SOLD in North American. I chewed the service manager a new one over that.

Bottom line is that a Mercedes hypoid axle either with an open differential or limited slip is the same technology as most front engine, rear drive cars regardless of country of origin, and the recommended axle oil is a generic API spec: SAE 80W-90 GL5, and it's readily available. Brand makes no difference. Just make sure you buy a product that has the API "donut" with the above spec contained therein.

If the diff is a limited slip (clutch type ,what GM calls Positraction) you'll need a 4-oz. bottle of friction modifier. Mercedes sells it, but so does NAPA (NCB 4285V) and just about any other parts chain under their own part numbers

I went through a similar deal over recommended oil for the manual transmission, but that's another story.

Duke
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  #5  
Old 04-11-2021, 05:57 AM
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Id stick with MB 235.0 hypoid oil.

I tried the synthetic in my w140 and I noticed some humming coming from the rear,
had the right amount in there it just didn't seem to be protecting as good.

I switched back to the 235.0 mineral based and it's solid.

Fuchs TITAN Gear Hyp 90 Hypoid Gear Oil GL5 85w-90 was the one I used and it states on their website this is as High-performance gear oil for highly-stressed differentials in commercial vehicles and passenger cars

when you think about it these are heavy beasts and 235.0 mineral hypoid was the original spec the differentials tolerances were designed around.

Theres no combustion going on in the diff so a mineral oil is gonna last just as long as a synthetic... maybe even longer!
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  #6  
Old 04-11-2021, 11:00 AM
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75- 140 valvoline in mine. gets hot in these mountains
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  #7  
Old 04-12-2021, 09:20 PM
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For over 30 years I have been using red line in all diifs , no issues ever https://www.redlineoil.com/gear-oil-for-differentials.

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