Modifications to oldest, dirtiest VW, Audi TDI diesels approved by EPA

Volkswagen TDI 'clean diesel' television ad screencapVW Group of North America now owns hundreds of thousands of Volkswagen and Audi TDI diesel vehicles it has bought back from owners under the terms of various diesel emission scandal settlements. Yesterday, it got some very good news: the EPA has approved a modification that will it allow it to resell the oldest and dirtiest of those vehicles...