What are the engine choices?
Cadillac offers two engines. Both are sophisticated units equipped with Variable Valve Timing (VVT) that help deliver smooth, efficient performance. A 24-valve V6 engine displaces 3.6 liters and arrives standard in the base car. Power is an impressive 255 horsepower and 255 lb.-ft. of torque. More importantly, however, is the engine’s ability to deliver 90 percent of peak torque between 1,600 and 5,800 rpm. Pricier STS models arrive with a 4.6-liter Northstar V8, producing 320 horses and 315 lb.-ft. of twist. In addition to VVT, both powerplants employ electronic throttle control. A five-speed automatic is the only transmission offered.

Is the Cadillac STS RWD only?
Cadillac STS V6 models are driven only by the rear wheels, while V8 models can be RWD or AWD. Eventually, however, AWD will become available across the lineup. Under most circumstances this AWD system distributes torque in a 40/60 split favoring the rear. But when traction fades, all four wheels adjust to maximize grip. The AWD hardware works in harmony with StabiliTrak, GM’s electronic traction and stability control system.