The Cadillac STS was first introduced in 2005 as a successor to the Seville full-size luxury sedan. In fact, its name stands for Seville Touring Sedan. GM have the STS a major overhaul for 2008, including exterior, interior, and performance improvements.

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In terms of size, the STS is positioned between the CTS and DTS sedans. However, when it comes to price, the STS is the most expensive of the three.

Built on the rear-wheel-drive Sigma platform, the STS can be ordered with all-wheel-drive. Other optional features include adaptive Magnetic Ride Control suspension, a heads-up display, and a 300-watt Bose stereo system.

2008 update

General Motors took the wraps off the freshened Cadillac STS sedan for the 2008 model year. The sedan features a new standard 298-horsepower V6 engine, a host of new technologies, and significant interior improvements.

Up front, the dual-textured, multi-faceted grille first seen on the Sixteen concept and incorporated on both the Escalade and soon-to-be-launched 2008 CTS, has been adapted to the STS. Vertically stacked headlamps with large, dual 70mm projector lenses are encased in an aluminized, single-piece bezel. High Intensity Discharge (HID) headlamps are now available on V6 models.

Also available on V-6 models for the first time are Intellibeam headlamps. The headlamps automatically switch gradually from high beam to low beam when vehicles approach or the vehicle is approaching taillamps. The lower front fascia is a new design, with a new intake and grille patterned after current Cadillac 'V' cues. New, narrower side marker lamps are added.

Similarly, side air extractors, again inspired by the Sixteen and Escalade, are now incorporated in the front fenders of the STS.

New styling touches also include chrome-plated door handles and new lower rocker moldings that blend into the lower line of the vehicle for more presence and refinement.

At the rear, the new fascia is now body-color, and is highlighted with the addition of polished, aluminum three-inch exhaust tips.

New, polished 18-inch by 8-inch aluminum 14-spoke wheels are available. For these available wheels, Michelin W-rated, 235/50R18 tires are used up front, and the rear wheels are fitted with 255/45R18 all-season radials.

Brembo brakes with four-piston calipers provide improved braking, with front rotors measuring 14-inch by 1.2-inch (355mm x 32mm) coupled with 14.4-inch by 1.1-inch (365mm x 28mm) rear rotors.

New interior

Inside, the STS's interior includes a new steering wheel with available genuine Sapele Pommele wood trim. A heated steering wheel also is available. The center stack of the instrument panel is revised with the addition of wood trim that has new metallic surroundings.

An optional head-up display projects key driving information (such as speedometer ratings) onto the windshield, enabling drivers to keep their eyes on the road.

The 2008 STS will offer a performance handling package; enhanced variable-effort steering with StabiliTrak on V8 models; and new lane departure warning and blind side alerts.

New V6

For 2008, STS will be the first GM vehicle equipped with a new 3.6-liter direct-injected V6 engine. The new base powerplant, with 298 horsepower (222 kW), delivers 40 more horsepower; and torque is increased to 268 lb.-ft. (371 Nm) - up from 252 lb.-ft. (348 Nm) on the current base engine. The new direct-injected 3.6L will be mated to the Hydra-Matic 6L50 six-speed automatic transmission.

Advantages of the new direct-injected engine include a 25-percent reduction in cold-start hydrocarbon emissions. Additionally, despite the 15-percent increase in power, fuel economy is expected to increase slightly.