2004 differential goes out

Mercedes operating fluids

Been buying Mercedes cars for whole family for over 20 years and never heard about differential failure, even few of them passed 300k miles.
Commercial MB vehicles put US mechanics to skill test as for example Sprinter vans, making 2-3 millions km in Europe without major repair - are falling apart on US ground.
MB USA is known for goodwill repairs on items that should last lifetime, so why don't you call 800 FOR MERC

SidecarFlip wrote:
Been our experience at the shop to never switch from the OEM approved lubricant for any powertrain related component.

What he said.

Many Ford trucks come OEM with synthetic oil in the diffs.

fj12ryder wrote:

Captain_Happy wrote:
I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.

You need to find another mechanic.

Yep, that one was an idiot.

Captain_Happy wrote:
I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.

You need to find another mechanic.

Been our experience at the shop to never switch from the OEM approved lubricant for any powertrain related component.

I was told once by a mechanic to never put syn oil in a rear diff because the oil wouldn't stay on the axle long enough to get out to the bearings.

"Oil was changed at 50,000 with synthetic oil"

Is/was the synthetic oil specifically approved by brand name and weight, by Mercedes?

Quicksilver, has a Fuller 10/5/13 Transmission, auxiliary, and OD.

If ANYTHING other than fifty weight mineral oil is used, the transmission and auxiliary will fail. Not a mere chance of failing - a 100% guaranteed burnout. Even super-magic 101% ultra synthetic lubricants will fail this powertrain device. I am not aware of any Fuller approved alternative for 50 weight mineral oil. I learned how to, and rebuilt several of these turkeys including my own and for a fact the needle bearings of the twin countershafts will seize. Fuller countershafts are so sensitive they have to be "timed" to each other.