Hi as you can see i have a bug on the Ferrari Paint, i save it with BC1 sRGB DX10+ like the vanilla paint but i don't know if its caused by the paint_d or the paint_s. I didn't change the paint_s it's the vanilla texture.
Not entirely familiar with the Ferrari s-file but that would most likely be your culprit. S-file is responsible for the finish of the paint. The RGB values for the proper finish are in the Mod Questions Thread where you should be posting questions like this.