My final carcols.dat file:
Place in game folder/common/data/
Don't forget to backup!

I changed the lightest colors into one step darker and added the most clear colors, so it's 50% lightning, 100% lightning, 150% lightning.
The 100% lightning colors can be chosen in a trainer.
The combinations are on the cars, they can appear as well light as dark.

#My Black To White
0,0,0,-,black, # 134 Black
48,48,48,dark,grey, # 135 B25W
128,128,128,-,grey, # 136 Grey
176,176,176,light,grey, # 137 B75W
255,255,255,-,white, # 138 White

#My Red
128,0,0,dark,red, # 139 R25W
255,0,0,-,red, # 140 Red
255,128,128,light,red, # 141 R75W

# My Orange
128,64,0,dark,orange, # 142 R50Y25W
255,128,0,-,orange, # 143 R50Y
255,192,128,light,orange, # 144 R50Y75W

# My Yellow
128,128,0,dark,yellow, # 145 Y25W
255,255,0,-,yellow, # 146 Yellow
255,255,128,light,yellow, # 147 Y75W

# My Lime
64,128,0,dark,green, # 148 Y50G25W
128,255,0,-,green, # 149 Y50G
192,255,128,light,green, # 150 Y50G75W

# My Green
0,128,0,dark,green, # 151 G25W
0,255,0,-,green, # 152 Green
128,255,128,light,green, # 153 G75W

# My Spring Green
0,128,64,dark,green, # 154 G50C25W
0,255,128,-,green, # 155 G50C
128,255,192,light,green, # 156 G50C75W

# My Cyan
0,128,128,dark,blue, # 157 C25W
0,255,255,-,blue, # 158 Cyan
128,255,255,light,blue, # 159 C75W

# My Dodger Blue
0,64,128,dark,blue, # 160 C50B25W
0,128,255,-,blue, # 161 C50B
128,192,255,light,blue, # 162 C50B75W

# My Blue
0,0,128,dark,blue, # 163 B25W
0,0,255,-,blue, # 164 Blue
128,128,255,light,blue, # 165 B75W

# My Purple
64,0,128,dark,pink, # 166 B50M25W
128,0,255,-,pink, # 167 Purple
192,128,255,light,pink, # 168 B50M75W

# My Magenta
128,0,128,light,pink, # 169 M25W
255,0,255,-,pink, # 170 Magenta
255,128,255,dark,pink, # 171 M75W

# My Deep Pink
128,0,64,dark,pink, # 172 M50R25W
255,0,128,-,pink, # 173 M50R
255,128,192,light,pink, # 174 M50R75W