Before we jetted to the Mediterranean, though, we got to play with the A4 on its home turf. Following our visit to the R8 factory in Neckarsulm, we jumped into a fleet of A4 sedans for a run to the home office in Ingolstadt. The cars for that journey were a mix of 2.7L and 3.0L TDI V6 units with your humble narrator opting for a 3.0L manual transmission quattro variant. If you want to understand why Europeans love their diesel engines, just fly into Stuttgart, rent an A4 3.0 TDI quattro and make the run to Munich via Neckarsulm and Ingolstadt. Do you that and you may never touch another gasoline engine.