Audi S6
Audi made a high-performance, 4.2-litre V8 engine (parts code prefix: 077, identification code: AEC) with a Bosch KE-Motronic ECU available as an option in the original European S4s, and made the decision to continue to do so with the S6, making a version of the 4.2 available as an optional upgrade over the 2.2-litre inline five-cylinder turbo. Unlike the five-cylinder turbocharged version, the V8-powered S6 was supplied with a four-speed automatic transmission as standard, but kept the quattro four wheel drive. A six-speed manual gearbox was also available as an option.
Audi A6
There are now six petrol and four diesel engines available for the upgraded A6. All petrol engines now feature cylinder-direct Fuel Stratified Injection (FSI) technology, and all diesel engines now feature common rail (CR) and Turbocharged Direct Injection (TDI) technologies. There is a new petrol engine, a 3.0-litre supercharged V6, badged as 3.0 TFSI or 3.0T. This new engine is shared with the 2010 Audi S4 and S5 Cabriolet, although in the latter two applications in a higher state of tune and mated to a 7-speed S-tronic dual-clutch transmission.