[RugbyBro]

Honestly I don't care for any of the "big" car youtubers - as it relates to BMWs, very, very few know anything more than whatever tear-sheet they use tells them about the car. "Reviews" are nearly always filled with inaccuracies and parroting stupid/generic talking points. Not to mention that social media is now one of the de-facto marketing channels for big business (very much so for auto-manufacturers). The one channel I think is a bit better than the rest is SavageGeese although they sometimes fall victim to the aforementioned pitfalls.

I'm more interested in watching guys who are getting down and dirty with their cars and sharing their technical learnings. Some channels I've liked:

Tommy L Garage is an awesome DIY resource for a lot of common mods
FaRKle! has some really awesome suspension/brakes/kinematics related content for the platform
BluesCluesM3 (don't know his @) - turned his F80 into a track tool, awesome series of videos to reference how that is achieved on the platform plus lots of great track videos