Diesel technology has changer more then almost any other piece of technology in the automotive industry, Audi Diesel is at the forefront of the diesel field. In the United States clean diesel technology is relatively new and so not understood 100%. The new 2010 A3 TDI starts great in cold weather, however as an option you can get pre-heater (block heater) for those times were the tempaures dips below freezing. This morning the temperature here at Sunset Porsche Audi was below freezing and I decided to check the start up of the TDI A3 and it had no problem, it started right up. Have a great start to the holiday season and remember to drive safe.