Type F, I believe, ATF is what came in the gearbox from the factory. I have Dex/Merc in the '83 and have had since just after I bought the car almost five years ago. Changing the fluid took care of a grumpy 2nd gear synchro, and things are doing just fine. Granted, it doesn't get driven all that much. I have a couple quarts of MTF that will, eventually, go in there. Low on the priorities list, though.

Jay

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On the road, currently:
'83 300D (German spec.) 168k mi. - - Wolfgang (tucked snugly away for the winter!)
'87 300D 375k mi. - finally went over to "The Dark Side"
'87 300TD 225k mi.
Cannondale 66cm CAAD5 w/Campy/Jamis Aurora
Hujsak Custom Fixie/Landshark Track Shark Custom/Ahearne Custom 29'er