Quote:
Originally Posted by 09carreras
One of my friend's and my M3 both have that. Our cars were built in May June 2018. I had a 2016 model and it wasn't as obvious on that car. I know that today because my friend bought my old car. The reason for that line is they must have had a mold repair that makes the bumper and now there is a witness line there
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This would explain it for sure and seems to be what has probably happened. Especially since older car owners report that they don't see it. maybe a new mold or repaired mold was used starting for 2018 since it seems like all those reporting it have '18 cars.