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Powertrain components are required by EPA to have a 10yr/100k miles warranty, I thought? So it's not exactly the same situation because fundamental parts of the powertrain are covered by a longer warranty.

That doesn't appear to be true [1]. It seems like a majority of powertrain warranties are in the 4-6 year and 50k-70k mile range. Tesla's 4 year and 50k warranty on this part would therefore be on the low end, but it matches the powertrain warranties for Audi, BMW, Volvo, Mercedes, and several other manufacturers.

[1] - https://www.motor1.com/features/253277/comparing-new-vehicle...

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