The Cadillac STS comes with a choice of V6 ($42,390) or V8 ($51,810) engines. The high-performance STS-V ($75,010) comes with a supercharged V8. The V6 comes with a five-speed automatic transmission. Both V8s come with a six-speed automatic.
All-wheel drive is available for the V6 ($1900) and base V8 ($1550), but not the STS-V.
Luxuries that come standard with the V6 include leather trim, dual-zone automatic climate control, Bose AM/FM/CD stereo, and the usual lineup of power creature comforts and driver aids. OnStar telematics (with one year's service), StabiliTrak electronic stability control, automatic headlamp high-beam control, and rear park assist are also standard.
The popular V6 Luxury Package ($3,690) adds two-driver memory for seats, mirrors, climate and radio controls; Rainsense wipers; 6-disc in-dash CD-changer; Eucalyptus wood trim on the instrument panel, steering wheel, console and center stack; dual heated and ventilated front seats with four-way power lumbar, heated rear seats; heated steering wheel; tire pressure monitor, universal home remote; and a cargo net.
To that list the V6 Luxury Performance Package ($5,995) adds a limited slip rear differential, Premium ZF steering gear, performance cooling package, rear spoiler, Brembo performance brakes, and P235/50R18 front tires and P255/45R18 rear tires on 18-inch, 9-spoke polished aluminum wheels.
The V8 Luxury Package ($4,295) includes Bose 5.1 surround sound, Xenon HID headlamps with washers, IntelliBeam automatic high/low beam control with flash to pass feature, interior auto-dimming rearview mirror with OnStar controls, and heated and ventilated front seats. (Most of the content of the V6 Luxury Package is standard on the V8 model.)
The V8 Luxury Performance Package ($8,190) includes all Luxury Package features plus Premium ZF steering gear, performance cooling package, Magnetic Ride control, rear spoiler, Brembo performance brakes, P235/50R18 front tires, P255/45R18 rear tires, and 18-inch, 9-spoke polished aluminum wheels.
The Performance Handling Package ($1,600) offers special springs and shocks for rear-drive V8 models.
Options for V6 and V8 models include a Bose 5.1 surround-sound stereo ($2,145), premium leather seats ($1,295), a power glass sunroof ($1,200) and the Brembo brakes ($3950). Two of the nine exterior paints, Infrared and Diamond White, cost extra ($995). Adaptive cruise control ($2,300) is also available for both models, as is an engine block heater ($100).
STS-V comes with a higher level of standard equipment, including EZ Key with remote start, XM Satellite Radio, rear AV jacks, rear climate system controls, rear obstacle detection, hand-wrapped leather surfaces with suede seat inserts, Olive Ash Burl wood and aluminum interior accents. Special paint and the engine block heater are the only options; the sunroof can be deleted for credit.
Safety features that come standard on all models include dual two-stage frontal airbags, front seat mounted side airbags and front-and-rear side curtain airbags. Four-wheel anti-lock brakes are standard along with StabiliTrak electronic stability control. Tire-pressure monitors are standard on V8s and available as part of the Luxury package on V6. OnStar comes standard; its operators when send out the rescue squad if your airbag goes out and you don't respond to calls.