The 2009 STS is a 4-door, 5-passenger luxury sedan, or luxury sports sedan, available in 5 trims, ranging from the V6 to the V8 Premium Luxury Performance.
Upon introduction, the V6 is equipped with a standard 3.6-liter, V6, 302-horsepower engine that achieves 17-mpg in the city and 26-mpg on the highway. The V8 Premium Luxury Performance is equipped with a standard 4.6-liter, V8, 320-horsepower engine that achieves 15-mpg in the city and 24-mpg on the highway. A 6-Speed automatic transmission with overdrive is standard on both trims.
The 2009 STS is a carryover from 2008.
