Changing texture changes it on everything (car colour)

Hello!

I’d like to add different selectable colours to my cars, but if I copy the Car body and put a different texture on it it changes the material on all car bodies to the new colour.

How can I make the car bodies “unique”?

Duplicating a model does not duplicate the associated material. You need each model to have its own material. Unity 3d Tutorials - Basics - #5 Materials - YouTube