adblueaudicardieselgreenAudi's R8 TDI is a green muscle machineThursday, January 24, 2008 - 6:56am The VW diesel station wagon I had in high school was the most unsexy car imaginable: it took about 5 minutes to warm up, rumbled like a farm tractor, and did 0 to 60 in about 2 minutes flat....