After disappointing standing-start-acceleration numbers in our testing, all 2021 M550i xDrive cars will receive a software fix this summer.

BMW will be informing 2021 M550i xDrive buyers and dealers this week that the 523-hp sports sedan isn’t as quick as promised. In standing-start acceleration, the ’21 M550i can’t quite deliver on the claimed 3.6-second zero-to-60-mph time. Earlier M550is are apparently not affected.
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