Engine.cs

// Inheritance
namespace Test
{
  class AutoMobile
  {

  }
  class Car: AutoMobile
  {

  }
}

// Composition
namespace Test2
{
  interface IAutoMobile { }
  class AutoMobile: IAutoMobile { }
  class Car: IAutoMobile 
  {
    private AutoMobile mobile = null;
    public Car() 
    {
      mobile = new AutoMobile();
    }
    public void Method1 () 
    {
      this.mobile.Method1();
    }
  }
}