Multiple Random Numbers

Hey how can i make the col1 random on each vehicle created it can be same on some but not all of them can have the same color.

Random r = new Random();

col1 = r.Next(0, 159);

CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);
CreateVehicle(-614, -352, 34,col1, col2, 0);