If you look at the specs, the two German luxury saloons are quite similar. The BMW sports a quad-turbocharged straight-six diesel engine producing 400 bhp (298 kilowatts) and 1,030 pound-feet (760 Newton-metres) of torque. A turbocharged V6 diesel powers the Audi, making 350 bhp (260 kW) and 949 lb-ft (700 Nm) of torque. The extra oomph gives BMW the performance edge. During testing, the BMW outperformed the Audi.
The M550d hit 62 miles per hour (100 kilometres per hour) in 4.81 seconds compared to the S6’s 5.3-second time. However, the Audi was able to close the gap before crossing the quarter-mile distance, completing the run in 13.41 seconds, a tiny bit longer than the BMW’s 13.01-second time. The BMW’s performance prowess shines again, though, when the two cross the 124-mph (200-kph) barrier. It took the BMW 18.71 seconds to reach it while it took the BMW 21.13 seconds.
It’s easy to see how similar the two models are when watching the video. Yes, the BMW’s extra performance gives it an edge, but it’s not enough to leave the Audi in the dust. Both are capable performance estates that should put smiles on the faces of both drivers and passengers.