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Engines evolving from one generation to the next tend to improve in several ways, generally with more horsepower, a fatter torque curve and the newest technology.
Oddly enough, BMW goes in the opposite direction and still arrives at a winning formula.
This new TwinPower Turbo 3.0L diesel inline-6 (codename N57) in the 535d sedan now uses a single variable-geometry turbocharger in place of two separate turbos on board the earlier version that won Ward's 10 Best Engines trophies in 2009 and 2010.
The previous diesel also used the latest fast-acting piezoelectric fuel injectors, while the new one makes do with less sophisticated coil-based solenoid-valve sprayers that are less expensive but still can deliver six separate injections per combustion stroke. More injections make for a quieter diesel.
The earlier version made an extra...