Asking prices climb for used VW TDI diesels as buybacks proceed

2015 Volkswagen Golf TDI SEIf you have your eyes on a used Volkswagen or Audi TDI turbodiesel, you may wind up having to pay more today for 2009 through 2015 models than you would have when they were new. At least right now, only 2015 model-year versions of VW and Audi vehicles sold with the 2.0-liter turbodiesel 4-cylinder TDI engine can be modified to comply with...