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I just discovered this thread. About a year ago ended the lease on our 2012 550xi a few months early for a M5. We had a lot of battery, injector, and drivetrain issues - fortunately all under warranty. My dealer was pretty good about taking care of me. Good to see in a way that BMW is addressing the issues. Fortunately no problems so far with the M5.
The Road and track article is interesting reading. I suspected that the electronics were part of the problem and it is good to see confirmation of that. They really need to evaluate whether the fuel savings by not charging the batteries fully is worth it now that they have a better idea of the consequences in cost and reputation.
The issues we had in part pushed us into looking at other brands after more than 15 years of having almost exclusively BMWs. We now have two Porsches, each of which replaced a BMW. I really like my M5 but we'll have to see what is out there when my lease ends.
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