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Dyno-Tested: 2012 BMW Z4 SDrive28i

It's true, BMW is phasing out its traditional 3.0-liter inline-six and replacing it with a turbocharged four-cylinder. Across the board, no exceptions, the aspro mill will soon be gone  -- finis, stick a fork in it.

    The 2012 BMW Z4 SDrive28i is the first to receive the new four-pot heart, alongside the 2012 528i. We've only driven the sedan at a site far from our slide rules and abaci, but we did recently‚Ķ