Honestly guys, the line between the mainstream and luxury carmakers is now approximately vanish
Toyota mainstream and have Century, which frankly speaking neither Benz nor BMW got a head 2 head answer for it
In the opposite side Benz has A class which was built on Nissan, Audi most of its vehicles are just Skoda , Seat and Volkswagen
Kia has the Stinger which is capable in both luxury and both
Ford Explorer for my taste is more perfect and luxury than its Lincoln brother , same goes to Highlander and RX
They need to define what makes a carmaker luxury and what makes it mainstream
Is it pricing, fit and finish, build quality if so it will be unfair not to call Mazda, Toyota & Kia example from few a luxury carmaker and give that same title to Volkswagen and Peugeot which from my view can never be a luxury makers