The experimental 10-cylinder was developed for a sport sedan, and it was believed to have been destroyed.

The E39 BMW M5 is often credited with starting the German horsepower ... Autobahn performance was to ditch the 6.2-liter ...

We'll never know whether the engine would've been more reliable than BMW's notorious S85, which also powered the M6 E63/E64. It is believed that Piëch was so fond of the custom M5 that he used it ...