Is your differential beginning to leak fluid from the front pinion seal?
 
You should replace your pinion seal before the differential loses all the oil and begins to damage the internal gears and bearings.
 
Replace it with a top quality Elring seal. Elring is an Original equipment supplier to Mercedes Benz vehicles.
 
This part will suit the following MB Vehicles
 
W105 Sedan      (1953 to 1962)
W120 Sedan      (1953 to 1962)
W121 Sedan      (1956 to 1961)
W128 Sedan      (1958 to 1959)
W128 Cabrio      (1958 to 1960)
W128 Coupe      (1958 to 1960)
W180 Sedan      (1954 to 1959)
W180 Cabrio      (1956 to 1959)
W180 Coupe      (1956 to 1959) 
R121 190SL       (1955 to 1963)
 
This part is shown as 46 on the attached parts Diagram
 
Original Part Nos:- 
A0009971346
A000 997 13 46 
0009971346
000 997 13 46 
000 997 1346 
000-997-13-46 
 
No longer available from Mercedes Benz. Our price only $42.50
NB:- this item is advertised on other sites and may be sold without notice.
 
Please check you have the correct part number for your vehicle.
 
Most parts for W105. W120, W121, W128, W180 & R121 190SL cars available.
 
McStarparts – “We keep classic Benz’s on the road.”