The Cadillac STS comes with a choice of V6 or V8 engines. The V6 comes with a five-speed automatic transmission that sends power to the rear wheels. All-wheel drive is available for both models and a new 6-speed transmission is standard for the V8. The STS comes with leather trim, dual-zone automatic climate control, OnStar telematics, Stabilitrak electronic stability control, automatic headlamp high-beam control, and rear park assist.For 2007, the STS V8 gets a new 6-speed automatic transmission.