Several car paint presets are available in the attribute editor for the Car Paint shader.

Base

Weight

Color

Roughness

Specular

Weight

Color

Flip Flop

Light Facing Color

Falloff

Roughness

IOR

Transmission Color

Flakes

Flake Color

Flip Flop

Light Facing Color

Falloff

Roughness

IOR

Scale

Density

Layer

Normal Randomize

Coord Space

Coat

Weight

Color

Roughness

IOR

Normal