According to a recent report by Car and Driver, Audi will be offering a diesel option for the soon to be released 2012 S6 and S7 Sportback models.
Official details have yet to be released, but there is speculation that the diesel variant will likely have a 3.0-liter TDI powerplant rivaling the gas engine in power. The diesel will have less horsepower but more torque; somewhere around 350-hp and 479 lb-ft of torque.
The gas engine is expected to be a 430-hp turbocharged 4.0-liter V8, which Audi will share with the Bentley Continental GT.
Designed for the European market, it’s unclear (and unlikely) that the diesel S6 or S7 Sportback will be offered in North America.
[Source: Car & Driver]