We’ll just come right out and say it: Audi lost the plot with the last generation S4. Unlike the twin-turbocharged V6-equipped B5, its B6 and B7 brethren did little to stoke the flames in our collective hearts. The “S” simply stood for, “I paid more for a bigger engine and... 

The 3.0-liter, 240-hp diesel that first served in the Audi Q7 has been assigned to duty in the Audi A4. We drove the 3.0 in the Q7 during last year’s Audi Mileage Marathon, and both mileage and power didn’t disappoint. Put into the A4, the oil burner with 369 lb-ft should shine like Alpha...