I once was looking into trading my 2013 F30 335xi for a Jeep Wrangler in 2016 ( never did it was a pos). They said oh it’s a 3 series and we offer you like 18k trade in. They didn’t know or care what kind it was or packages. Over a year later traded to bmw for 25k.
Very possible the dealer has no clue what M that is
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