Meaning of the word "including" with "and/or" [closed]

Using "or" gives the impression that you are sure that they sell Audi and you think that they sell either BMW or Opel but you aren't sure which.

Using 'including' implies the exact opposite of 'exclusively', it means that they sell other brands as well as the ones you have listed.

Also English speakers don't speak of places where cars are sold as 'shops'. Large establishments with enclosed sales spaces, particularly those selling new cars, are called 'showrooms' or 'dealerships', smaller ones selling used cars are mostly called 'car lots' and, sometimes, a British English speaker will still call a small car lot a 'garage' which we used to use before we adopted the originally American 'car lot'.