Are 09 Subaru Engines the Same as 2010?

If you’re a Subaru owner or a potential buyer, you might be wondering whether the 2009 Subaru engines are the same as the 2010 engines. This question is crucial, especially if you’re planning to upgrade to a newer model or replace your vehicle’s engine. In this article, we’ll provide an in-depth comparison of the two engines and highlight their differences and similarities.

Key Takeaways

  • Subaru 09 engines and 2010 engines share the same engine architecture, but there are some differences in the engine components.
  • The 2010 Subaru engines have a more advanced ECU and are more fuel-efficient.
  • The 2009 Subaru engines were prone to head gasket failures, which led to engine overheating and damage.
  • Always consult a qualified mechanic before purchasing or replacing an engine.

The Comparison

Engine Architecture

The 2009 and 2010 Subaru engines share the same engine architecture, which means that the engines’ fundamental design is the same. Both engines have a horizontally opposed, four-cylinder design, which is a hallmark of Subaru.

Engine Components

While the architecture of the two engines is the same, the components of the engines differ slightly. The 2010 Subaru engines have revised cam phaser angles, an updated intake manifold design, and a new turbocharger. These subtle changes make the engine more efficient and reliable than its predecessor.

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Fuel Efficiency

One of the significant differences between the two engines is their fuel efficiency. The 2010 Subaru engines have a more advanced ECU (engine control unit), which helps the engine adjust fuel and air mixture more accurately. This, combined with the revised intake manifold design and updated turbocharger, results in a more fuel-efficient engine.

Head Gasket Issues

One of the main issues with the 2009 Subaru engines was head gasket failure. Head gasket failure is a severe problem that can cause overheating and severe engine damage. The 2010 Subaru engines had some improvements to the head gaskets, which made them more reliable and less prone to failure.


The 2010 Subaru engines have a slightly better performance than the 2009 engines. The updated turbocharger and cam phaser angles make the engine more responsive and smoother. However, these differences in performance are subtle, and most drivers might not notice the difference.


The cost of the two engines varies depending on where you purchase them. However, in general, the 2010 Subaru engines are more expensive than the 2009 engines. This is because the newer engine has more advanced components and is more fuel-efficient.


Can I swap a 2009 Subaru Engine for a 2010 engine?

Yes, you can swap a 2009 Subaru engine for a 2010 engine. However, you should consult a qualified mechanic before doing so. Swapping an engine is not a straightforward process, and there are many things to consider, such as compatibility, wiring, ECU, and other factors.

What is the difference between a 2009 Subaru Forester and a 2010 Subaru Forester?

The 2009 Subaru Forester and the 2010 Subaru Forester are two different models of the Forester. While the two models share many similarities, such as their engine architecture, there are differences in the engine components’ design, interior, and exterior features.

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How long do Subaru engines last?

Subaru engines are known for their durability and longevity. With proper maintenance, a Subaru engine can last up to 200,000 miles or more. However, this depends on how the vehicle is driven and maintained.


In conclusion, the 2009 and 2010 Subaru engines share the same engine architecture, but there are differences in the engine components, fuel efficiency, head gasket issues, and performance. While the 2010 Subaru engines are slightly more advanced and fuel-efficient than the 2009 engines, both engines are reliable and durable. If you’re planning to upgrade to a newer model or replace your vehicle’s engine, always consult a qualified mechanic and do your research to ensure you make an informed decision.

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Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

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