Volkswagen got a lot of mileage out of its 3-liter turbocharged V-6 diesel engine at the 2008 Los Angeles Auto Show. It appeared in the Touareg TDI and the Audi Q5 TDI, signaling Volkswagen's launch of diesel SUVs in the U.S. This engine uses a complex emissions system that lets Volkswagen and Audi sell the vehicles in all 50 states. A particulate filter gets rid of the bigger stuff, while a solution called AdBlue breaks down nitrogen oxide emissions. Also on hand was the much more powerful TDI-powered Volkswagen Baja 1000 competitor.