How do I create a new instance of an object when using the module pattern?

I am using Javascript's "module pattern" to create a new class. Here's what I have:

var Car = (function() {
    var internal = {};

    internal.init = function(color, brand) {
        internal.color = color;
        internal.brand = brand;

        return internal;
    }

    return internal;
})(); 

However, when I create new instances it seems to all return the same data:

var ferrari = Car.init('red', 'ferrari');
var audi = Car.init('blue', 'audi');

console.log(ferrari.color + ' ' + ferrari.brand); // --> "blue audi"
console.log(audi.color + ' ' + audi.brand);       // --> "blue audi"

How do I go about fixing it so that it returns the data it was initialized with?