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The jury is out on that question. Since the Terrell differential (transaxle) is very lightly loaded in a Citicar, and has the gear types that are found in a regular transmission, my guess is that it is probably OK for this application.
There are quite a few people out there that use Pennzoil Synchromesh in transmissions of much higher powered vehicles which makes me believe that it should work fine.
Pennzoil Synchromesh and many other transmission oils are rated at GL-4 from what I can find out, which won't hold up in a regular high-powered car differential.
Since you have a more conventional type of differential in your Comutacar (Dana/Spicer), you might need the pressure abilities of regular differential lube (GL-5 rated) because of the ring/pinion gear set - but maybe not since the Comutacar doesn't have very much power or weight either.
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