When I bought both the 83 & 84 the boots where all cracked up, within a small amount of miles the boots tore and the oil flooded out. So I rebuilt the axles and noting that inside the differential was quite dirty from metal & the fluid was pretty old, possibly original, I searched for a good temporary oil. I found a thread here about how Mobil 1 synthetic cleaned their diff out. So Mobil 1 I bought for both as temporary fluids, figure I'll leave them in for at least a few thosand miles then drain it and put the redline in. Mobil 1 is fine and dandy in my book, but I still like Redline better for differentials.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k