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PERFORMANCE: Under the hood of both 2006 3-Series models is a 3.0-liter inline six-cylinder engine. That's not unusual for a BMW, nor is its dual overhead cam, 24-valve specification. But this engine, codenamed N52, breaks new ground. Its construction is highly unusual. The cylinder and water jacket assembly is cast from aluminum-silicon alloy, and the die cast magnesium alloy upper crankcase assembly is shrunken onto that.
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It makes extensive use of aluminum, to reduce unsprung weight and so improve suspension response, and is anchored to an aluminum subframe to isolate road noise and reduce sprung weight. A new five-link system is used at the rear; it also is anchored to a subframe to reduce noise and vibration, and improve crash safety. The springs and shocks are tuned for a soft but well-controlled ride, which, in the European fashion, not only allows but encourages spirited driving. There is a little stiffness noticeable over small road irregularities, caused by the stiff sidewalls of the standard run-flat tires. Such is the penalty of run-flats.
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