Photo: Wikimedia Commons (CC)
Power
0–62 mph (0–100 km/h)
Top speed (248 km/h)
Combined, EPA 2011
What owners say
Our take, from owner reports
Sentiment is mixed and heavily dependent on model year and powertrain.
7 problems reported (2 very frequent, 4 recurrent, 1 isolated) · high confidence
Problems owners report
- Very frequentNorthstar V8 engine oil leaks
Very frequent leaks from valve covers, oil pan, and less commonly the half-case seal.
- Very frequentDriveline component failures
Worn motor mounts, differential bushings, and driveshaft carrier bearings (especially on AWD models) causing clunks, shudders, and shifting harshness.
- RecurrentV6 (3.6L LLT/LFX) timing chain issues
Related to excessive oil consumption from a flawed PCV system; can lead to chain stretch and failure if oil is not monitored and topped up frequently.
+ 4 more issuesShow fewer
- RecurrentParts scarcity for AWD models
Specific components like the AWD driveshaft carrier bearing are not sold separately by GM, requiring entire assembly replacement.
- RecurrentInterior material quality
Use of hard, brittle plastics and overall fit/finish criticized as subpar for the luxury segment, especially in mid-2000s models.
- RecurrentTransmission behavior (5L50e)
Clunky, harsh, or inconsistent shifting, particularly at low speeds; often attributed to failing driveline mounts rather than internal transmission failure.
- IsolatedInfotainment (CUE) software glitches
Isolated mentions of uncorrectable software flaws, such as an inability to set the correct date.
The version owners recommend
The 2008 model year is recurrently cited as a "golden year" for the second-generation STS, representing a point where many early issues were reportedly addressed. For performance, the STS-V with its supercharged Northstar V8 (469 hp) is highlighted as a potent, rare, and undervalued performance sedan. For a balance of features and perceived reliability, later model years (2008-2011) are generally preferred over earlier ones.
Competitors to consider
Owners compare it most often with the Lexus IS-F, Cadillac CTS/CTS-V, Cadillac DTS, BMW 5-Series/E60 and Lincoln Town Car/Fleetwood.
Is the STS right for you?
Get an answer for your year, mileage and budget.
Full owner reportHide full owner report
Overall sentiment
Sentiment is mixed and heavily dependent on model year and powertrain. Long-term owners of the second-generation (2005-2011) rear-wheel-drive STS express strong affection for its driving dynamics, describing it as a "thrill to drive," with precise, "rifle-like" steering, excellent handling for its size, and strong acceleration, particularly from the V8 models. The vehicle is praised for its comfortable, supportive seats, powerful Bose stereo systems, and its underlying character as a "4-door Camaro." However, significant and very frequent criticism is directed at the reliability and maintenance costs of key components, especially concerning the Northstar V8 engine's reputation for oil leaks (valve covers, oil pan, half-case) and the high cost of repairs. The V6 models (3.6L) are noted for potential timing chain issues related to oil consumption. Additional recurrent complaints include difficult parts sourcing for the AWD variants, failing driveline rubber components (motor mounts, differential bushings, driveshaft carrier bearings) leading to clunkiness, and subpar interior material quality for a luxury sedan, particularly in pre-2008 models. The consensus indicates deep satisfaction among enthusiasts who value its sporty, rear-drive character and are willing to manage its upkeep, but wariness from those prioritizing low-cost ownership.
Positioning vs competitors
Positioned as a sportier, rear-wheel-drive alternative to the front-wheel-drive, floatier Cadillac DTS, which is described as a smoother, more isolated "traditional Cadillac" experience. Frequently compared to the contemporary Cadillac CTS, with the STS viewed as a larger, more refined, but sometimes more complex and harder-to-source-parts sibling. The Lexus IS-F is mentioned as a competitor with superior interior quality and Toyota reliability, though the STS-V is noted for its more accessible price and torque. Compared to German rivals like the BMW 5-Series, the STS is acknowledged for offering a potent V8 and engaging drive at a significant value discount, but at the expense of interior refinement and long-term reliability perceptions.
Recommended configurations
Rear-wheel drive (RWD) is strongly implied as the preferred configuration over All-Wheel Drive (AWD) for simpler maintenance, better parts availability, and modification potential. The V8 engine is praised for its torque and character, though the V6 is acknowledged as sufficient. A thorough pre-purchase inspection focusing on engine leaks, driveline mounts, and transmission behavior is considered essential. Ownership requires a commitment to using high-quality fuel and adhering to strict oil change intervals (5,000-6,000 miles) to mitigate known engine issues.
General recommendations
Suitable for driving enthusiasts and Cadillac loyalists who appreciate a large, comfortable, yet engaging rear-wheel-drive sedan and are mechanically prepared or financially ready for potential repairs. Ideal as a second car or for owners who perform their own maintenance. NOT recommended for buyers seeking a low-maintenance, appliance-like luxury car or for those on a tight budget who cannot absorb unexpected repair costs. Essential to verify meticulous maintenance history, specifically for oil changes and addressing common leaks. Test drive should include low-speed maneuvering to check for driveline clunks and a highway merge to assess transmission behavior. Given the age and complexity, purchasing from a knowledgeable enthusiast or with recent major service records is advantageous.
Remarks
The reputation of the Northstar V8 is a defining factor, with a clear generational divide noted in owner discussions. The revised, post-2005 RWD Northstars used in the STS are consistently described as having none of the catastrophic head bolt/gasket failures associated with the earlier FWD versions, though they remain prone to external oil leaks. The vehicle's platform sharing with the contemporary Camaro is frequently mentioned to explain its capable chassis. Dealer and aftermarket support is perceived as dwindling, making owner forums and specialist knowledge critical for maintenance. The STS, particularly in V8 form, is seen as a compelling, depreciated performance luxury sedan that rewards hands-on ownership but can punish neglect. Analysis based on approximately 45 substantive owner discussions.
Generation by generation
Owner insights per generation and US complaint/recall records (NHTSA).
Complaints and recalls by model yearWorst year: 2006. Years to avoid: 2006, 2005Source: NHTSA (US)Show table
Each year graded against the model's other years: Year Score. See all Cadillac STS years to avoid
| Year | Complaints | Recalls | Most-reported area |
|---|---|---|---|
| 2011 | 7 | 0 | electrical system |
| 2010 | 4 | 0 | fuel/propulsion system |
| 2009 | 15 | 0 | air bags |
| 2008 | 50 | 1 | air bags |
| 2007 | 53 | 2 | air bags |
| 2006 | 141 | 4 | air bags |
| 2005 | 101 | 3 | electrical system |
Complaint counts come from owner reports filed with the US National Highway Traffic Safety Administration. Higher-selling years naturally accumulate more complaints.
Recall notices10 on record · Source: NHTSA (US)Show recalls
2008 · exterior lightingcampaign 08V108000
GM IS RECALLING 4,586 MY 2008 CADILLAC STS AND STS-V PASSENGER VEHICLES FOR FAILING TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 138, 'TIRE PRESSURE MONITORING SYSTEMS' (TPMS). THE STANDARD REQUIRES AN INDICATION TO THE DRIVER FOR CERTAIN TPMS MALFUNCTIONS. WHEN THE SYSTEM DETECTS A MALFUNCTION, THE LOW TIRE WARNING LIGHT SHOULD FLASH FOR ABOUT ONE MINUTE AND THEN STAY ON THE REMAINDER OF THE IGNITION CYCLE. A DRIVER INFORMATION CENTER MESSAGE WILL ALSO BE DISPLAYED ON THE INSTRUMENT PANEL.
2007 · fuel system, gasoline:delivery:fuel pumpcampaign 14V542000
General Motors LLC (GM) is recalling certain model year 2004-2007 Cadillac CTS-V vehicles manufactured October 6, 2003, to March 15, 2007, and 2006-2007 Cadillac STS-V vehicles manufactured June 23, 2005, to March 15, 2007. In the affected vehicles, the electrical terminals of the fuel pump module may overheat resulting in the melting of the flange material.
2007 · power train:axle assembly:axle shaft:sealcampaign 07V589000
ON CERTAIN PASSENGER VEHICLES, THE REAR AXLE PINION SEAL DOES NOT MEET ALL OF THE SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.
2006 · fuel system, gasoline:delivery:fuel pumpcampaign 14V542000
General Motors LLC (GM) is recalling certain model year 2004-2007 Cadillac CTS-V vehicles manufactured October 6, 2003, to March 15, 2007, and 2006-2007 Cadillac STS-V vehicles manufactured June 23, 2005, to March 15, 2007. In the affected vehicles, the electrical terminals of the fuel pump module may overheat resulting in the melting of the flange material.
2006 · vehicle speed controlcampaign 06V007000
ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH ALL WHEEL DRIVE AND A 3.6L V6 ENGINE, THE TORQUE MONITORING FUNCTIONS OF THE ELECTRONIC THROTTLE CONTROL (ETC) ARE NOT ENABLED. THESE FUNCTIONS CAN LIMIT ENGINE SPEED AND TORQUE IF UNUSUAL ENGINE CONTROL MODULE (ECM) HARDWARE OR SOFTWARE FAILURES OCCUR.
2006 · power train:axle assembly:axle shaft:sealcampaign 07V589000
ON CERTAIN PASSENGER VEHICLES, THE REAR AXLE PINION SEAL DOES NOT MEET ALL OF THE SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.
2006 · fuel system, gasoline:deliverycampaign 06V020000
CERTAIN VEHICLES EQUIPPED WITH V6 ENGINES MAY HAVE A CONDITION WHERE FUEL IS NO LONGER SUPPLIED TO THE ENGINE. THIS CONDITION OCCURS WITHOUT THE ILLUMINATION OF THE FUEL LEVEL LOW INDICATOR LIGHT OR THE WARNING CHIME.
2005 · power train:axle assembly:axle shaft:sealcampaign 07V589000
ON CERTAIN PASSENGER VEHICLES, THE REAR AXLE PINION SEAL DOES NOT MEET ALL OF THE SPECIFICATIONS AND MAY EXPERIENCE A FLUID LEAK.
2005 · fuel system, gasoline:deliverycampaign 06V020000
CERTAIN VEHICLES EQUIPPED WITH V6 ENGINES MAY HAVE A CONDITION WHERE FUEL IS NO LONGER SUPPLIED TO THE ENGINE. THIS CONDITION OCCURS WITHOUT THE ILLUMINATION OF THE FUEL LEVEL LOW INDICATOR LIGHT OR THE WARNING CHIME.
2005 · suspension:rearcampaign 06V125000
CERTAIN VEHICLES HAVE A LEFT OR RIGHT REAR SUSPENSION TOE LINK THAT COULD SEPARATE BECAUSE OF AN INCORRECT WELD.
Specifications
4.6 i V8
4.6L 8-cylinder · 325 hp · AWD · automatic
Built 2006–2011