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75d 0-100

Looking at Tesla website at the different vehicles available in stock.
There is a s 75d used that says 0-100 5.8sec. And a new 75d that says 0-100 4.4 sec. Is this the software unlock and could the used one get upgraded.
Yes, its called uncorking. Most S75Ds can be uncorked. You'll find with a full battery it's a bit quicker than 4.4 seconds too, more like 4.0-4.2.
It's also hard to tell if one can be updated. I have a Model S 75D manufactured in Nov 2016. It's one of the first with AP2 and new nose cone etc. It just recently had the "uncorking" done at service and is now a (approx) 4.4 0-100kmh car (equivalent of the USA 4.2 second 0-60mph).

I'd suggest getting Tesla to confirm if the 5.8 car can be uncorked before purchasing if it's important to you.