I think I now know where and what the leak is and I've ordered the right fluid from Fastlane per M.B. Doc's excellent advice. Fluid is ~ $9 a bottle. Now if the leak is just a loose fitting that I can torque right (i.e., not break!), I'll be all set.

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1992 Black 500e
1991 Black 300te 4m
1992 Black Renntech 620sl
1979 Porsche 911sc targa