The problem was primarily particulates, and that has been taken care of. Most diesel cars now have a separate urea tank which functions as after treatment. Oth

The problem was primarily particulates, and that has been taken care of. Most diesel cars now have a separate urea tank which functions as after treatment. Others (primarily trucks) use exhaust gas recirculation instead so that they don't have to maintain two fluid tanks. I'm quite a car nerd, and generally when people come to me asking whether they should get a Prius, I typically ask them about their driving habits. I live in San Diego, where there are lots and lots of freeways, so diesel cars do really well here and I often recommend them. Hell, the newer Audi diesels are quite good performance-wise as well (torque for days! woohoo!!)