Update:
I went to the dealer and live demonstrated this sound. They say, it's a normal compressor sound. I must say, that we were outside at a charching station, so it didn't sound as "loud" as in my garage. Somehow logic. They now recorded it and will compare it with another i8.
My friend who works at this dealer as a sales, also asked two top i- technician from other dealership and BMW Headquater Switzerland. Both haven't jet seen comressor failures on i8's and i3's.
Will update again, when the comparison with the other i8 is done.
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