Model change part colour

I have imported a Toyota Rav 4 model which is white. I want to change it to dark grey without having to select a thousand different faces or to change the colour of everything such as the wheels.

You may be lucky depending on how it has been modeled. If done correctly you would be able to select the appropriate Group/Component and simply repaint it. But without seeing the model no one can guess that.
Another option would be to find the White in the materials panel and edit it to Gray, perhaps they have only painted the correct panels white.

Thanks box, I found the white and edited to dark grey. Looks like my Dad’s car now.