I had my 2011 E350 rear subframe replaced for goodwill plus about £150 in bits and pieces that weren't covered by the goodwill apparently. Some people pay more, others pay nothing. But to your point, I definitely have nothing like full service history. I could guess my car hasn't been to a Merc dealer in 5 or more years. But, I do use an independent specialist who uploads the work they do to the Merc digital service book, so they do at least have a record that my car has been serviced.