Issue with List.Contains()

Methods such as Contains, IndexOf, LastIndexOf, and Remove use an equality comparer for the list elements. The default equality comparer for type T is determined as follows. If type T implements the IEquatable generic interface, then the equality comparer is the Equals method of that interface; otherwise, the default equality comparer is Object.Equals."   So, you should implement the IEquatable interface on your Car object, and tell it to compare the _name elements for the equality test. 
  e.g. (not a complete class !)   public class Car : IEquatable 
{ ... protected string _name;  public string Name { get { return _name; } ... } 
 #region IEquatable Members 
 public bool Equals(Car other) 
{ bool result = false;  
if( this.Name == other.Name ) 
{ result = true; } 
 return result; 
}  #endregion
 }