It's best to choose your car color according to your kua number. Choose a color that produces the element of your kua. For example, if your kua number is 3 or 4 (wood element) then go for a blue or black car (water produces wood); if your kua number is 6 or 7 (metal element) then choose an earth colored car like brown, tan or cream.
If you're mixing color combinations, then choose the color of the element of your kua and the color of the element that produces it. Following this kua method is a great way when it comes to choosing the color for your next vehicle.
If you do not know your kua number you can find out easily by going to https://www.wofs.com/kua-number-calculator/.