Before discovering this thread I created one here for a friend with a 2017 Model
S:
2017 vs. 2021
People who responded seemed to universally (and unfairly?) dismiss the idea from the start. But supposedly the Tesla mobile tech gave my friend those figures (e.g., $10K and $25K). And I was told that the tech was talking about having the work done at Tesla? My friend needs to follow up.
With the cost of a new Model S (~$100K), it seems to me that at least exploring the idea of replacing the batteries and/or drive-train (to get two motors) is worth considering. Same is true for the even more expensive Model X. But somehow, I don't think it would just be $35K. A new Model S Long Range would be great for my friend. But other than its relatively low range the 2017 still has some attractive advantages (e.g., the free supercharging). And they
like their 2017. They just want more range. Are there things like suspension, structural integrity, and safety features that also need to be considered and make a new car the much better choice?