The Cadillac STS used a 4.6-liter Northstar V8 as its standard engine, while the performance-focused STS-V model employed a 4.4-liter supercharged V8 producing far more power. This reflects Cadillac’s approach to blending luxury with sportier performance in the mid-2000s era.
Base Cadillac STS engine
The standard engine powering the non-V STS models was the 4.6-liter Northstar V8. Below are some core details about this powerplant.
- Engine: 4.6-liter Northstar V8
- Configuration: V8, dual overhead cam (DOHC), 32-valve
- Materials: aluminum block and heads designed for smooth, high-rev performance
- Output: roughly around 320 horsepower, with torque in the low-to-mid 300 lb-ft range depending on model year
- Application: used in the STS sedan from its launch years through the late-generation run
In short, the base STS relied on the refined Northstar 4.6L V8 to balance luxury smoothness with adequate acceleration for a flagship Cadillac sedan.
STS-V: the high-performance variant
The STS-V model was introduced to deliver a higher level of performance, pairing Cadillac luxury with a more aggressive powertrain. The key facts about this engine are listed below.
- Engine: 4.4-liter turbocharged/supercharged V8 (supercharged Northstar-derived design)
- Power: about 469 horsepower
- Torque: approximately 439 lb-ft of torque
- Configuration: V8, high-performance variant tuned for rapid acceleration and higher output
- Production window: STS-V was built from 2006 through the late-2000s before the model line evolved
The STS-V’s engine represented Cadillac’s performance-focused engineering, offering substantially more straight-line speed and a more assertive driving character than the standard STS models.
Summary
Across its lineup, the Cadillac STS showcased two notable powertrains: the standard 4.6-liter Northstar V8 for everyday luxury performance, and the 4.4-liter supercharged V8 in the STS-V for high-performance capability. Together, they defined the model’s approach to blending refined refinement with exciting power.