2013 Subaru Legacy 2.5L Engine

2.5L • FB25 • DOHC • Boxer 4-Cylinder • VIN A • Federal Emissions

Looking for a used engine for your 2013 Subaru Legacy? This page covers the 2.5L FB25 engine used with the automatic CVT Federal-emissions application, including important engine identification and fitment information.
The 2013 Subaru Legacy 2.5i uses a naturally aspirated 2.5L horizontally opposed four-cylinder engine. For the application covered here, confirm VIN A in the 6th position, Federal emissions specification and CVT configuration before choosing a replacement.

2013 Subaru Legacy 2.5L Engine Overview

The 2013 Subaru Legacy 2.5i marked an important change in the Legacy’s four-cylinder powertrain.

The 2.5L application uses Subaru’s FB25 engine family. Unlike a conventional inline four-cylinder engine, the FB25 uses Subaru’s horizontally opposed—or boxer—layout. The cylinders are positioned horizontally on opposite sides of the crankshaft.

The North American 2013 Legacy 2.5L FB25 has approximately 2,498 cc of displacement, 173 horsepower at 5,800 rpm and 174 lb-ft of torque at 4,100 rpm. It uses a DOHC cylinder-head design.

For this particular replacement application, you’re looking for:

2013 Legacy → 2.5L → CVT → Federal Emissions → VIN A → DOHC

That complete combination is more useful for fitment than simply searching for a generic Subaru 2.5L engine.

ENGINE PROFILE

2013 SUBARU LEGACY

2.5L • DOHC • FEDERAL EMISSIONS • VIN A

SUBARU BOXER ENGINE

FB25

2.5L DOHC BOXER

Horizontally opposed 4-cylinder gasoline engine used in the 2013 Subaru Legacy 2.5L application.

2.5L DOHC H4 NATURALLY ASPIRATED

DISPLACEMENT 2,498 CC

POWER 173 HP

TORQUE 174 LB-FT

CYLINDERS 4 BOXER / H4

VALVETRAIN DOHC 16-VALVE

FUEL GAS NATURALLY ASPIRATED

YEAR 2013

MODEL LEGACY

TRANSMISSION CVT

EMISSIONS FEDERAL

VIN A • 6TH

VERIFY BEFORE ORDERING: Confirm the complete VIN, Federal emissions application and vehicle configuration before selecting a replacement engine.

Need an Engine for Your 2013 Subaru Legacy?

When an engine has suffered serious internal damage or repair costs become too high, replacing the complete engine can be an alternative to rebuilding the existing unit.

For this 2013 Subaru Legacy, don’t search only by “2.5L Subaru engine.” Subaru used different 2.5L engine families and configurations across different years and vehicles.

For this page, the target application is:

2013 + Subaru Legacy + 2.5L + FB25 + DOHC + CVT + Federal emissions + VIN A

Before buying a used engine, confirm as much of this information as possible.

How to Identify the Correct 2013 Subaru Legacy Engine

Step 1 — Confirm the Model Year

Start with 2013. Engine applications can change between model years even when the vehicle looks very similar.

Step 2 — Confirm the Engine Size

This application uses the 2.5L naturally aspirated engine.

Step 3 — Confirm the Engine Family

The relevant engine family is FB25. The FB25 replaced the older EJ-series 2.5L engine in this North American Legacy application. Fifth-generation Legacy specifications distinguish the earlier EJ25-powered cars from the later FB25 2.5i configuration.

Step 4 — Check the VIN

For the application you’re listing, look at the 6th character of the VIN.

It should be:

A

This is one of the important identifiers for the Federal-emissions/CVT engine application you’re targeting.

Step 5 — Confirm Emissions

Your application specifies:

Federal Emissions

Don’t remove this detail from the page simply because two engines look visually identical. Emissions configuration can be part of the interchange information used when identifying a replacement assembly.

Step 6 — Confirm CVT Application

Your inventory description specifies AT (CVT).

Use the complete vehicle information when speaking to the parts agent rather than assuming that every FB25 assembly is automatically interchangeable.

What Is a Subaru Boxer Engine?

One of the most recognizable characteristics of this Subaru engine is its boxer layout.

Instead of arranging the cylinders vertically in a straight line like an inline-four, the FB25 positions its cylinders horizontally on opposite sides of the crankshaft.

This gives the engine its wide, low shape.

For someone looking at a loose used engine, that shape is one of the easiest ways to distinguish a Subaru boxer engine from a conventional inline four-cylinder engine.

The 2013 Legacy’s 2.5L FB25 is a DOHC horizontally opposed four-cylinder rather than the older SOHC EJ253 configuration used in earlier Legacy applications.

Why Choose AutomartAutoparts?

Finding the right used engine or transmission can be stressful, especially when you're not sure about compatibility, availability, or where to find the right replacement. Automart Auto Parts helps make the process simple. We have helped many customers find replacement engines and transmissions for a wide range of vehicles, and our parts specialists are here to help you identify the right option for your vehicle.

With so many used engines for sale online, finding the correct replacement can be difficult. Automart Auto Parts helps make the process simpler by helping customers identify appropriate used engine applications based on their vehicle information.

With multiple warehouse locations across the state, we can help customers connect with available parts closer to their area. Our network and inventory sources allow our team to check available replacement engines and transmissions based on your vehicle's requirements.

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Trusted by Customers

We've helped many customers with their replacement engine and transmission needs, providing assistance throughout the process.

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Multiple Warehouse Locations

With multiple warehouse locations across the state, our network helps us serve customers in different areas and check for available parts closer to them.

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Fitment Assistance

Not sure which engine or transmission you need? Our parts specialists can help verify your vehicle and part information before you move forward.

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Availability & Pricing

We can check current availability and provide pricing information based on the replacement part your vehicle requires.

A Simpler Way to Find Your Replacement Part

You don't have to spend hours comparing used motors for sale and trying to determine which engine will work with your vehicle.

Tell our team your vehicle's year, make, model, engine size and VIN when available. Our parts specialists can use that information to help identify the appropriate replacement application and check available options.

Whether you need a used engine for a car, truck or SUV, starting with accurate vehicle information makes it easier to narrow down the correct replacement.

Looking for a Used Engine for Your Subaru Legacy?

If your 2013 Subaru Legacy needs an engine replacement, focus on compatibility before price or appearance.

A replacement engine should be checked against your vehicle’s engine family, model year, emissions application, transmission configuration and identifying information.

For this particular Legacy, you’re looking for the 2.5L FB25 DOHC application associated with the CVT, Federal emissions and VIN A identification.

Provide the complete vehicle information when requesting availability so the correct application can be checked.

How It Works

Finding the right replacement engine or transmission is simple. Tell us about your vehicle and our parts specialists will help you find the right replacement option.

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Tell Us Your Vehicle

Provide your vehicle's year, make, model and engine or transmission information. We may also ask for your VIN to help confirm compatibility.

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Tell Us What You Need

Let us know whether you're looking for a used engine, replacement engine, used transmission or replacement transmission.

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We Check Availability

Our parts specialists check available inventory and supplier options to help identify a suitable replacement for your vehicle.

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Get Your Quote

Once an appropriate option is identified, our team can provide available pricing and relevant part details for you to review.

FAQ

What engine is in the 2013 Subaru Legacy 2.5i?

The North American 2013 Legacy 2.5i uses a 2.5L FB25 horizontally opposed four-cylinder engine. The application is DOHC and has 2,498 cc displacement.

How much power does the 2013 Subaru Legacy 2.5L make?

The North American FB25 Legacy application is rated at approximately 173 hp at 5,800 rpm and 174 lb-ft at 4,100 rpm.

Signs Your Subaru Engine May Need Attention

Engine problems can show up in different ways. Some symptoms worth investigating include:

Excessive oil consumption — If oil level falls unusually quickly, the cause should be diagnosed rather than repeatedly topping it off.

Knocking or abnormal mechanical noise — Internal engine noise can indicate a serious mechanical problem, although accessories and other components can create similar sounds.

Overheating — Repeated overheating can lead to major engine damage if the underlying cooling-system problem isn’t corrected.

Low compression — Poor compression in one or more cylinders can cause reduced power, rough running or misfires.

Coolant and oil contamination — Mixing fluids can indicate an internal sealing problem that needs diagnosis.

Persistent misfires — Misfires can come from ignition, fuel, sensor or mechanical problems, so diagnosis is important before deciding that the complete engine needs replacement.

Loss of power — Significant power loss can have many causes and should be properly diagnosed.

Important

These symptoms do not automatically mean you need another engine. Have the vehicle diagnosed before committing to a complete engine replacement.

Don't Confuse the 2013 FB25 With the Older EJ25

This is worth explaining because it can prevent a customer from choosing an engine based only on displacement.

Both engines may be described as a:

Subaru 2.5L 4-cylinder

But they belong to different engine families.

Earlier fifth-generation North American Legacy 2.5i models used an EJ25-series 2,457 cc engine, while later versions moved to the FB25 2,498 cc engine. The FB25 application is listed at 173 hp and 174 lb-ft for the North American Legacy.

So when shopping for a replacement for this vehicle, don’t choose an older EJ-series engine simply because it is also labeled “Subaru 2.5L.”

Is the 2013 Subaru Legacy engine an EJ25?

For the 2013 North American 2.5i application discussed here, no—the relevant engine family is FB25. Earlier fifth-generation 2.5i Legacy models used the EJ-series engine before the FB25 application.

Can I buy any FB25 engine for my 2013 Legacy?

Don't assume so. FB25 engines were used across multiple Subaru vehicles and model years. Verify the exact application and any vehicle-specific components before purchasing.

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