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Originally Posted by SW19
Do we know for sure that BMW won’t add a 48v hybrid system to the S58 engine until production ends for the G80,G82 and G87?
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We don't know for sure. However, forum member lemetier has strongly hinted that it will come sometime during the G8x run.
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It would be nice to know because i don’t want a hybrid M car.
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These aren't hybrids in the traditional sense. It's basically an evolution of the 12V electrical system found in cars for a century or more. It allows for efficiency gains through brake energy regeneration and provides a small electric power assist to the engine.
However, there is indeed a small weight penalty attributed to the additional hardware, and I think that auto start/stop can no longer be switched off (but that could theoretically change for M models).