i was in the exact same situation just a week ago.
I went ahead and just purchased the extra 2 years (starts from manufacturing date of 2019 so 6 year platinum package)
2019 i8 with 20k miles and it was about $5500 FYI (called teresa from what other people recommended in the forums)
I havent used it yet but as of now i do feel more at peace when it comes to driving the car if that amounts to anything
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