Axle oil replacement om 123,126 Mercedes

 Always start by removing the fill plug first! That would be the top one.

 Your favorite gear oil...

 Tools needed.
Ratchet 1/2 inch drive
14mm Allen socket 1/2 drive
Extension tube for better leverage
Suction gun

 Drain the old gear lube oil.

 Using your suction gun, pull on the lever to siphon as much oil as you can into the gun then push the lever to add oil in the differential.