See also:

STS adds direct-injection V-6
For 2008, STS will be the first GM vehicle equipped with a new 3.6-liter direct-injected V-6 engine. The new base powerplant, with 298 horsepower (222 kW), delivers 40 more horsepower; and torque ...

Safety
Side-impact airbags are installed in the seats. The seat belts have powered pretensioners. Four-channel all-disc antilock brakes, traction control and a stability system are standard. ...

Sedan and Wagon Base Model
From the inside, use the door lock knob on the top of doors. ...