In America the normal term is "European", not "luxury".
It would be somewhat odd to specialize in both American and European luxury cars. It'd be significantly less odd to service a RR and a BMW 3er next to each other.
The actual company’s website says European, not luxury. My guess is that the OP wasn’t familiar with this distinction and just figured luxury means the same thing (the car shop is his brother’s as per the link.)
The actual company’s website says European, not luxury. My guess is that the OP wasn’t familiar with this distinction and just figured luxury means the same thing (the car shop is his brother’s as per the link.)