Quote:
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In the United States, for regulation purposes, government authorities allow cars of a given model year to be sold starting on January 1 of the previous calendar year. For example, this means that a 2019 model year vehicle can legally go on sale on January 1, 2018.[3] This has resulted in a few cars in the following model year being introduced in advertisements during the NFL's Super Bowl in February.
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Now as for what bmw does for model vs manufacture date Im not sure.