It's a sample of one, but I've owned my E85 Z4 since its inaugural year (13 years) and it's been flawless. The only thing I've done other than regular service is that I just had to have the AC recharged last year for the first time, which is not surprising given how much I use it here in NC, even sometimes while topless.
As I consider replacing it with an F83 M4, I am a bit concerned about the increased complexity of a turbocharged engine versus my NA. At least they're both straight sixes.
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