The current Subaru Legacy models use a 2.5-liter horizontally opposed four-cylinder engine, commonly called a boxer engine. In earlier generations, Subaru also offered a larger 3.6-liter flat-six in certain trims.
This article examines the engine options that have powered the Legacy across its generations, how the setups differ, and what buyers can expect in terms of performance and efficiency.
Current and historical engine configurations
Engine options for the Legacy, including modern and historical configurations, are summarized below.
- The standard engine in recent Legacy models is a 2.5-liter horizontally opposed four-cylinder (boxer). It is typically naturally aspirated and produces roughly 170–182 horsepower depending on the model year, with torque in the mid-170s pound-feet. Most versions pair with Subaru's Lineartronic CVT and come with all-wheel drive.
- In select earlier generations, Subaru offered a larger 3.6-liter flat-six (EZ36) that produced about 256 horsepower and 247 lb-ft of torque, delivering stronger acceleration but lower fuel economy and higher weight.
In summary, modern Legacy models center on the efficient 2.5L boxer engine with a CVT and standard all-wheel drive, while older trims offered the more powerful 3.6L flat-six.
Notes and additional context
Turbocharged engines are not part of the Legacy lineup. Subaru’s turbo 2.4-liter flat-four used in some other models (notably the Outback and certain performance-oriented siblings) is not offered in the Legacy. The Legacy remains positioned as a practical, all-wheel-drive sedan with an emphasis on smooth power delivery and efficiency.
Performance and efficiency snapshot
For quick reference, here are approximate figures by engine variant (model years may vary):
- 2.5-liter flat-four: around 170–182 hp and 170–178 lb-ft of torque; typically paired with AWD and a CVT.
- 3.6-liter flat-six: around 256 hp and 247 lb-ft of torque; found in older Legacy trims, usually with an automatic transmission and AWD.
Note: Actual horsepower and torque depend on the exact model year and market. Always check the specific vehicle’s specifications for precise figures.
Summary
The Subaru Legacy’s engine lineup centers on a 2.5-liter flat-four for modern models, offering a balance of performance and efficiency with standard all-wheel drive and a CVT. A historical option, the 3.6-liter flat-six, provided stronger power in earlier generations but was phased out as Subaru moved toward the more economical 2.5L configuration.