I've always loved this colour since the E46 Ltd Edition and the E53 X5 4.8i.
I would have done Carbon this colour instead of the Monte Carlo blue, if it was an option of the original current bmw colours at the time of the respraying of Carbon.
Everytime I see an Estoril blue F20/30 I get frustrated that I didn't do Carbon in that colour.... Then I tell myself that the Monte Carlo is a M colour only, it's not available on any other model.
This puts Carbon in the "middle".
I love the Estoril so much, it's brighter than Monte Carlo
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