Java: Inner classes - How to have access to inner class variables

Hello,
I have a class car and an inner class engine. The inner class shouldn't be visible outside of the class car.
Is there still a way to give a Car an Engine as parameter?
Error: Car.Engine has private access in Car
Here is my code:

public class Main {
    public static void main(String[] args) {
        Car car = new Car("VW", "Red", new Car.Engine("Diesel"));
    }
}

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public class Car {
    private String brand;
    private String color;
    private Engine engine;


    public Car(String brand, String color, Engine engine){
        this.brand=brand;
        this.color=color;
        this.engine=engine;
    }

    public Engine getEngineType(){
        return new Engine(engine.getType());
    }


    public void setEngine(Engine engine){
        this.engine=engine;
    }

    private class Engine{
        private String type;

        public Engine(String type){
            this.type=type;
        }

        public String getType() {
            return type;
        }
    }
}

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