From a 4.2-liter V8 to a 5.2-liter V10 that carried ... very rare production Audi though - the first-generation Q7 V12 TDI.

With Audi's introduction of the Audi R8 V12 TDI, we got to look at the most unique aspect of this supercar - its diesel engine.Compression-ignition motors may be commonplace everywhere else in the ...

var digg_url = 'https://digg.com/autos/500hp_23_mpg_Audi_R8_V12_TDI_concept_leaked_before_Detroit'; Audi's having a spot of trouble keeping a lid on things ahead of ...

From a 4.2-liter V8 to a 5.2-liter ... the idea of putting a twin-turbo V12 engine in the Audi R8. The proof of concept was a model called the Audi R8 TDI Le Mans, and it envisioned a crazy ...