Hi OSM_RogerWilco,
Thank you for your valuable feedback to point out the presence of a free text instead of a list of brands. After examining the situation further and going through the guidelines (https://wiki.openstreetmap.org/wiki/Key:brand) I think that having a free text within the tag would not be practical while searching. I would suggest the following tagging if you agree with it too:
brand = Renault
description = Alle fabrikate, spez. Renault
All the best.