Mobil 1 synthetic has two weights, the typical 75w95 I think and then a heavier, I used it and it was helpful in reducing the noise. I used the synthetic Mobil1 since the diff had no leaks at all and they had a heavier weight, got it at Autozone. Worked good.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red