I think we all are....due to the changing instructions from Mercedes over the years. Pick your poison and see how it works. I had more trouble with mine when I had DexIII ATF in it Motor oil works better for me, and next time I'll try the Redline MTF and see which one gives me the smoothest shifts and stick with that.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT