Why did I sell Mercedes C W203? Cons of used Mercedes C-class 2000-2007 with mileage

More details about the pitfalls when buying Mercedes Benz C-class W203 (2000-2007 years of release). Why and for what reasons they can sell or simply "get rid" of a used car called Mercedes-Benz C-Klasse (203). We are talking about the problems and weaknesses of a used car.