Soldato
There's no way a dealer would ever offer retrofits like memory seats afterwards using your original example.
For the F10 5 Series - all the accessories and retrofits are here for example (some are region specific):
https://www.realoem.com/bmw/enUS/partgrp?id=5D12-EUR-02-2015-F10N-BMW-530d&mg=03
Outside of this, the dealer would not touch it! Other manufacturers will be the same in the sense that approved retrofits will be covered but finding options from the factory in the brochure and asking them to do it would never be allowed by the manufacturer.
For the F10 5 Series - all the accessories and retrofits are here for example (some are region specific):
https://www.realoem.com/bmw/enUS/partgrp?id=5D12-EUR-02-2015-F10N-BMW-530d&mg=03
Outside of this, the dealer would not touch it! Other manufacturers will be the same in the sense that approved retrofits will be covered but finding options from the factory in the brochure and asking them to do it would never be allowed by the manufacturer.