BMW's full-size flagship executive sedan. Typically, BMW introduces many of their innovations first in the 7 Series. For example, the somewhat controversial iDrive system debuted in the 7 Series. The 7 Series Hydrogen, featuring one of the world's first hydrogen fueled internal combustion engines, is fueled by liquid hydrogen and emits only clean water vapor. Since the infrastructure for refueling a hydrogen fueled engine is not widely available, the V12 engine also runs on gasoline. BMW has also developed a newer, more efficient hydrogen combustion engine, now on par with some of the most efficient diesel engines.Numerous engines also power the 7 Series worldwide. BMW offers diesel, straight 6, V8 and V12 motors, as well as the Alpina tuned supercharged V8. It is also available in a bulletproof version.
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