At the heart of it, it presumes BMW will never make another V8 M3. This is the case for the next 10 years, but for all we know there may be some breakthrough that brings a fuel efficient V8 with some sort of alternative fuel technology that makes it appealing to do another normally aspirated V8 M3. In my opinion, the next 10 years it will be a very attractive used car that knowledgable enthusiasts will pay a premium for.
Will it be a collectable or long tem classic?
It presumes that the technology will be accessible enough that people can continue to want to maintain it 20+ years from now to support the availability of technical pieces well beyond typical consumer interest for aftermarket parts. It's not a classic muscle car that you can fix with a decent set of tools... it's a computer on wheels and it's long term reliability and sustainability has not been proven out over 20, 30, 40 or 50 years.
And it also presumes that you keep very low miles on it. I'd guess V8 M3 with 200K miles on it is probably going to be worth less than a new Honda Accord.
I can see people beating each other up 40 years from now to get an all-original V8 M3 with less than 10k miles on the clock, where BMW has not made a V8 M3 ever again. But the same could be said of any 40 year old iconic high performance car with ultra-low miles.
2001 E46 330Ci - 42K miles, 2013 E92 M3 - Back from PCD
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