Differential Oil
No type of oil or quantities are given in the handbook or my manual.
Can anyone tell me what should be using (and how much I need to buy). Should I use an additive (like molyslip)?
It's got no leaks and it only makes the slightest whine on the over-run. Although MB say it's not necessary to change the oil, I think after seven years is must be ready for a change!
and P90 oil if i remember fully, hope this helps.
TRY YOUR LOCAL HALFORDS OR MOTORWORLD THEY USALLY HAVE AN OIL GUIDE WHICH TELLS U THE CORRECT AMOUNT AND GRADE OF OIL.
from many years of driving high mileage W124's, I would not recommend to open the differential, unless you see severe leaks. The whining is totally normal and does not necessarily go away anyway. Under no circumstance additives!!!!
The quantity given by the last poster is 1.1 litres. But the measure is to have it filled just to the level screw on the side (refilling is a mess, and, as I'm convinced not necessary)
Regards
Bamberger
The common opinion in here is that "Life Time" oils are frauds. You should change your transmission oil, etc. However I don't know if that applies to the differential.
The capacity is somewhere between 1-2 qts. So buy two quarts and you're good to go. I recommend using a synthetic fluid such as Mobil 1 75W-90. The spec is 80W-90, but that's a popular European grade not commonly available in the US.
I also recommend 60K intervals with the synthetic fluid, 30K for non-synthetic.



