[aerohead]

TESLA is using PENTOSIN ATF-9 for 20,000-rpm motors, which actually has a higher viscosity than the DEXRON-III ( 7.5 cSt, to as low as 5.5 cSt, vs 7.0 cSt )
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The upcoming PORSCHE/RIMAC Bugatti Tourbillon electric motors operate at up to 24,000-rpm.
SAE testing of automatic transmissions found that they can survive on as little 4.0 cSt kinematic viscosity, which would qualify as 'unobtainium'.
We ought to keep are ears to the rails, and look for technical bulletins regarding Bugatti's 'engineered from the ground up' ATF specifications, and any 'caveats' that would limit its use in earlier hypoid gear applications.