what is the best LSD oil for '93 K reg Japanese import? 
If you have a 93 import, standard from the factory, you will have a viscous LSD. Just standard 75W90 oil. Same goes for Torsen diffs.
On the otherhand, if you think the diff was replaced with a clutch type LSD (Mazdaspeed, Kaaz etc), then a bit more research is needed.
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thank you! 