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The newer BMWs, especially the xx8 engines are way more reliable than previous generations. Part of this is the fact that the newer engines haven't had the same mileage put on them, so we won't know for sure.
If you look at the Nxx forums you will clearly see more problems than a Bxx engine. Part of this is the fact that the newer engines haven't had the same mileage put on them, so we won't know for sure.
I'm stating the obvious here in that the new engines should not be less reliable than the prior generation.
Perhaps the people who can speak best to this are x3m s58 owners if any are over 50k miles and S55 owners
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