I've had my US-spec 2018 540d for over a year now too. I love it! No major complaints, ~13k miles so far. It was a little weird when BMW removed basically all references and information about it from their site suddenly shortly after I took delivery of the car.
BMW sold so few 540d models in the US (115 is the number I've seen thrown out there) so I think mine is probably the only one with the 4-zone climate and ambient air options, which were special requests I made when I ordered it.
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