If it was me, I'd go with "old Ford style ATF Type 2" - or whatever its called - from the pre-dexron era of early 1970's..... thinkin new additives and fancy ingredients might not jive with old seals possibly made of materials incompatiable with modern tranny fluids.

And find another shop too...... When the guy who replaced my clutch more than a year ago proudly told me he also changed tranny fluid with fresh 80wgt gear oil, I nearly threw the guy through the window of his shop!!!

Finally, itsa cynch that anybody eager to put gear oil into MB trannies has no clue in the world about 220Sb grease-gun suspension lube points underneath, easily the most often neglected critical maintenance items on the car which should be hit with grease at least twice each year.

http://www.peachparts.com/shopforum/showthread.php?threadid=91305&highlight=kingpin+lube