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c300 4matic, front diff, CTA 7415 adapter makes filling easy
Also did the front diff of this 2015 C300 4matic with 105k miles. Drain plug is right there on the passenger side - can't miss it - 6mm hex. WIS says capacity is 0.55L I only got out 0.43L and it was really dark. EPC does not show any vent and visually I don't see anything up thereso pushing will be the only way to fill it. I decided to push in 0.55 knowing that I would lose maybe 0.03 or so before getting the plug back in. What I don't know is - is it now slightly overfilled or did we lose about 100mL over that 105K miles...?
To push it in, I used a CTA 7415 (fcpeuro), this is the same adapter to push in the transmission ATF. The front diff and the trans use the same plug. I removed the adapter tubing from my trans setup and just taped it to the cheepo hand pump - worked great.
Don't forget to use a new copper ring, its the same one for the trans - A007603012102. Torque on the plug is 20NM.