Audi is celebrating 25 years of the TDI diesel engine, which has given the Ingolstadt-based automaker success both on the road and on the track. Audi has sold approximately 7.5 million cars equipped ...

Diesel engines have long gotten a bad rap in the U.S., but that's a tired story. We all know it, some of us even believe it, but so far not much of the U.S. populace has been exposed to a proper ...