mobile-menu-icon
GM Authority

Cadillac STS

The Cadillac STS was a midsize luxury sedan that spanned a single generation.

Quick Facts

First-Gen
Model Years 2005 – 2011
Platform Sigma
Engines Atmospheric 3.6L V6 LY7 (2005-2007), Atmospheric 3.6L V6 LLT (2008-2011), Atmospheric 4.6L V8 LH2, Supercharged 4.4L V8 LC3 (STS-V)
Transmissions Five-Speed Auto, Six-Speed Auto
Production GM Lansing Plant, Michigan, USA
Segment Midsize Luxury Sedan
Availability U.S.A, Canada, Europe

First Generation

2005 Cadillac STS.

2005 Cadillac STS

Model Years 2005 – 2011
Assembly Location GM Lansing Plant, Michigan, USA
Segment Midsize Luxury Sedan
Availability U.S.A., Canada, Europe
Layout Front-Engined, Longitudinal
Engine(s) Atmospheric 3.6L V6 LY7 (2005-2007), Atmospheric 3.6L V6 LLT (2008-2011), Atmospheric 4.6L V8 LH2, Supercharged 4.4L V8 LC3 (STS-V)
Transmission(s) Five-Speed Auto, Six-Speed Auto
Drive Wheels Rear-Wheel Drive, All-Wheel Drive
Platform Sigma
Refresh(es) 2008

Serving as the successor to the Cadillac Seville, the Cadillac STS – which is an acronym for Seville Touring Sedan – was positioned as the luxury marque’s biggest sedan offering. Based on the GM Sigma platform, the STS was the first Cadillac luxury sedan to be offered with AWD, and was also available with Magnetic Ride Control, a head-up display, and Bose stereo system.

Two powerplants were offered upon launch, including the naturally-aspirated 3.6L V6 LY7 engine, rated at 255 horsepower and 252 pound-feet of torque, and the naturally-aspirated Northstar 4.6L V8 LH2 engine, rated at 320 horsepower and 315 pound-feet of torque.

Model Model Year Engine Fuel Aspiration Transmission Horsepower @ RPM Torque @ RPM
STS 2005 – 2007 3.6L V6 LY7 Gasoline Atmospheric Five-Speed Auto, Six-Speed Auto 255 @ 6500 252 @ 3200
STS 2008 – 2011 3.6L V6 LLT Gasoline Atmospheric Six-Speed Auto 302 @ 6300 272 @ 5200
STS 2005 – 2011 4.6L V8 LH2 Gasoline Atmospheric Five-Speed Auto, Six-Speed Auto 320 @ 6400 315 @ 4400
STS-V 2006 – 2009 4.4L V8 LC3 Gasoline Supercharged Six-Speed Auto 469 @ 6400 439 @ 3900

The STS received a mid-cycle refresh for the 2008 model year that saw revisions to the exterior styling, including a larger grille and chrome fender vents – while the interior received revised materials and a new steering wheel. Under the hood, the 3.6L LY7 engine was replaced by the 3.6L V6 LLT engine, which produced 302 horsepower and 272 pound-feet of torque.

Optional safety features consisted of a Mobileye-developed Lane Departure Warning System, Blind Spot Monitoring, and an improved StabiliTrak stability control system.

2006 Cadillac STS-V

A high-performance STS-V model was available from the 2006 to 2009 model years. It was powered by the supercharged Northstar 4.4L V8 LC3 gasoline engine, rated at 469 horsepower and 439 pound-feet of torque, and was capable of delivering a 0-60 mph sprint in 4.6 seconds.

A long-wheelbase variant, dubbed Cadillac SLS, was offered in China.

Cadillac SLS.

Cadillac SLS

Sales

See STS sales numbers for global markets.

Discussion

Discuss the Cadillac STS in our Cadillac forum.

STS News

Cadillac STS Pages

Subscribe to GM Authority

For around-the-clock GM news coverage

We'll send you one email per day with the latest GM news. It's totally free.