So I noticed Tesla updated the drive unit oil in tool box to "KAF1"
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Looking through the Plaid EPA docs (LR still not uploaded), I noticed they list both "EDF2" (which I believe was the old fluid) and "KAF I"
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2023 docs show only EDF2. The main difference with the new fluid appears to be that it is not quite as thick at extreme temperatures. It appears they've already been using KAF I in the 4DU drive units in the model 3 / y. I wonder if that's part of the 2024 efficiency changes. And if that actually has a tangible benefit to range, I wonder if that's something worth doing for the rest of us.
2021 and 2022 docs show Mobil1 Dexron VI as the fluid, which is thicker still at extreme temps (11500 cP @ -40), still roughly same at 100C. Trying to look up the 40C numbers to calculate the viscosity curves. Mobil1 Dexron VI is 29.5cP @ 40C. Can't find the numbers for EDF2 or KAF I just yet.