By what E2mustang said on the brakes and the disc that did not benefit my renders.
I made an update of the brakes and used discs. and have some springs,
and update the rim and tire.
the scenes i made have long render time.
moste are 8 to 14 hours.
and i have only one vast pc.
Therefore I do not render much skins.
This scene is simple and takes about 2 hours
but I have not had time to convert all models to v-ray or m-ray
I want next year to try to convert all models.
and then do more other skins rendering.
I've now been focused to making scenes
If you can wait until after Christmas.
because before I have no time
I'm too busy with other things now to make a garage scene.
because not all cars have the proper materials.