Cant find this anywhere: What size tool is used for draining/refilling rear diff on my SD? Thank you.

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1985 300SD - 167k miles
1992 F350 7.3 (Soon to be converted to 2 tank Veggy/WMO)

14mm allen wrench.

Make sure you can remove the fill plug before you remove the drain plug.

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500

Instead of a 14mm Allen Wrench you can go the the Hardware store and by a 9/16 or if you can find one a 14mm coupling nut (they are several longer than the normal nuts). It will need to be long enough to go into the plug and have enough sticking out that you can use a Socket or other wrench on the part sticking out.
Some of the Threads idicate that it may be helpful to use some heat to help loosen the plug.

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84 300D, 82 Volvo 244Gl Diesel

Also for the SDs, you will need over 1 quart. I don't have my FSM here, but I believe it is something like 1.2 or 1.1.

Just buy 2 quarts when you are at the store and you will be good to go.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD