For the most powerful diesel car on the European market you have to go to Audi.
The new Audi SQ8 TDI is powered by a biturbo V8 engine that delivers a whopping 435 hp and 900 Nm. The sporty top version in the Q8 series will be available after the summer of 2019.
Audi SQ8 TDI The Audi SQ8 TDI is the sportiest and fastest Q8 you can buy. The sportier driving behavior is due to adaptive air suspension, adjustable sport dampers, a sport differential and four-wheel steering. The system that reduces tilt in curves also improves the stability in curves.
The diesel engine is equipped with an electric compressor that supports two turbos. With a capacity of 435 hp (320 kW) and 900 Nm of pulling power between 1,250 and 3,250 rpm (!), This is the most powerful diesel engine that you can get in a European passenger car.