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Originally Posted by TiMSport
The B58 engine seems to be pretty solid and I don't recall hearing any stories of major failures, knock on wood. I think BMW has improved the design to reduce engine wear and even emissions. The big question mark is long term reliability of the new 48v mild-hybrid setup. So far this has proven to be one of the best cars I've owned to date but I keep my eyes and ears open on the fellows that own the 2020 model and have relatively high miles racked up. As I said, I haven't heard of any major issues so far.
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With the latest turbos, BMW got smart and made the engine block a closed-deck design. IIRC, now all engine blocks are shared between diesel and turbo gas engines. That is the right design philosophy to follow.