Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
So what is a Volkswagen TSI engine? Volkswagen TSI vs TDI At the most basic definition, the TSI engine is the gasoline engine for Volkswagen, compared to the TDI which was the diesel. The acronym stands for âturbocharged stratified injection,â which is different from the FSI (fuel stratified injection) in that the engine uses a turbocharger.