Just bought 8 quarts of the genuine MB tranny fluid from my dealer (001 989 45 03 13). According to my tech, this is the fluid used in the newer transmissions, but he said that it works well in the earlier models too, especially the diesels that shift hard. It lists for 12.50/qt.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles