The BMW Z4 sDrive28i is a two-seater convertible sports car produced by German automaker BMW. It was first introduced in 2008 and released to the public in 2009. It is equipped with a 3.0-liter, turbocharged inline-six engine that produces 240 horsepower, and is mated to a six-speed manual transmission or optional eight-speed automatic transmission. The Z4 sDrive28i comes with rear-wheel drive and has a power-operated folding hardtop roof. It also offers a variety of standard and optional features, such as adaptive headlights, heated seats, and a navigation system.