Porsche News Audi focusing on a “straightforward” treatment for the three.-liter TDI V6 engine December 11, 2015 Christopher Bradley Leave a comment Volkswagen lately revealed the Dieselgate treatment for models outfitted using the 1.6- and a pair of.-liter TDI engines also it seems an answer for that 3.-liter V6 TDI engine is not far behind.