When Did Subaru Switch to Timing Chains?

Subaru made the pivotal shift from timing belts to timing chains in most of its engines starting around 2010–2012, with the introduction of the FB-series engines. This change improved long-term reliability and reduced maintenance costs for owners. The move marked a major engineering upgrade, especially in popular models like the Outback, Forester, and Impreza.

This is a comprehensive guide about When Did Subaru Switch to Timing Chains?.

Key Takeaways

• Subaru began switching to timing chains in 2010–2012: The transition started with the FB-series boxer engines, replacing older EJ engines that used timing belts.
• Timing chains last longer than belts: Chains don’t require scheduled replacements like belts, reducing long-term maintenance costs.
• Not all Subarus have timing chains: Older models (pre-2010) and some performance engines still use timing belts and need regular inspections.
• Improved engine efficiency and durability: The FB engines with timing chains offer better fuel economy, lower emissions, and smoother operation.
• Maintenance is still important: Even with timing chains, oil changes and engine care are crucial to prevent premature wear.
• Check your model and year: Use your VIN or owner’s manual to confirm whether your Subaru has a timing belt or chain.
• Timing chain issues are rare but possible: Listen for rattling noises or check engine lights, which could signal chain tensioner or guide problems.

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When Did Subaru Switch to Timing Chains?

If you’ve ever owned a Subaru—or even just shopped for one—you’ve probably heard the term “timing belt” thrown around. For decades, Subaru’s signature boxer engines relied on timing belts to synchronize the crankshaft and camshaft. These belts needed replacement every 60,000 to 100,000 miles, a routine but critical maintenance task. But around the late 2000s and early 2010s, something changed. Subaru quietly began phasing out timing belts in favor of timing chains in many of its engines. So, when exactly did Subaru switch to timing chains? And why does it matter?

The short answer is that Subaru started the transition around 2010–2012, coinciding with the rollout of its new FB-series boxer engines. These engines replaced the older EJ-series engines in many popular models, including the Impreza, Forester, Legacy, and Outback. Unlike the EJ engines, which used timing belts, the FB engines were designed with timing chains from the ground up. This shift wasn’t just a minor update—it represented a major leap forward in engine design, reliability, and long-term ownership costs.

But the story isn’t quite that simple. Not every Subaru made after 2012 has a timing chain. Some models, especially performance-oriented ones like the WRX and STI, continued using timing belts for several more years. And older Subarus—those built before the mid-2000s—are almost certainly belt-driven. So whether your Subaru has a timing belt or a chain depends on the model, engine type, and production year.

In this article, we’ll dive deep into the history of Subaru’s timing systems, explore the engineering reasons behind the switch, and help you determine what kind of timing system your Subaru uses. Whether you’re a longtime owner, a first-time buyer, or just curious about automotive tech, understanding this change can save you time, money, and headaches down the road.

The Evolution of Subaru’s Engine Technology

To understand when Subaru switched to timing chains, it helps to look at the evolution of its engine lineup. Subaru has long been known for its horizontally opposed “boxer” engines, a design that gives the cars a low center of gravity and smooth power delivery. But for most of the brand’s history, those engines relied on timing belts.

The EJ-series engines, introduced in the late 1980s, were the workhorses of the Subaru lineup for over two decades. Found in everything from the compact Impreza to the rugged Forester and the iconic WRX, these engines were known for their durability—but also for their high maintenance needs. One of the biggest concerns with EJ engines was the timing belt. Unlike timing chains, which are metal and built to last the life of the engine, timing belts are made of reinforced rubber. Over time, they can crack, fray, or break, especially if not replaced on schedule.

A broken timing belt in an interference engine—like most Subarus—can cause catastrophic damage. The pistons and valves can collide, bending valves, damaging cylinder heads, and requiring thousands of dollars in repairs. That’s why Subaru recommended replacing the timing belt every 60,000 to 100,000 miles, depending on the model and year. It was a necessary but costly part of ownership.

By the late 2000s, Subaru engineers began working on a new generation of boxer engines. The goal was to improve fuel efficiency, reduce emissions, and enhance performance—all while maintaining the brand’s reputation for reliability. The result was the FB-series engine, introduced in 2010. This new engine family featured a host of upgrades: direct fuel injection, improved combustion efficiency, and a more compact design. But one of the most significant changes was the switch from timing belts to timing chains.

Why Timing Chains? The Engineering Advantage

So why did Subaru make the switch? The answer lies in the fundamental differences between timing belts and timing chains.

Timing belts are lightweight, quiet, and inexpensive to produce. But they have a limited lifespan. Even with proper maintenance, they degrade over time due to heat, oil exposure, and normal wear. Replacing a timing belt isn’t just about the belt itself—it often requires removing multiple components, including the water pump, tensioner, and idler pulleys. Labor costs can easily run into the hundreds of dollars.

Timing chains, on the other hand, are made of metal and are designed to last the life of the engine—often 200,000 miles or more. They don’t require scheduled replacements, which reduces long-term maintenance costs for owners. Chains are also more durable under high-stress conditions, making them ideal for modern engines that operate at higher temperatures and pressures.

However, timing chains aren’t perfect. They’re heavier than belts, which can slightly reduce engine efficiency. They also produce more noise, especially when cold or worn. And while they last longer, they’re not immune to failure. Issues like stretched chains, worn tensioners, or damaged guides can still occur—though they’re far less common than belt failures.

For Subaru, the benefits outweighed the drawbacks. The FB-series engines were designed for modern driving conditions: better fuel economy, lower emissions, and longer service intervals. Timing chains fit perfectly into that vision. They allowed Subaru to market its vehicles as lower-maintenance alternatives to competitors, especially in the compact SUV and sedan segments.

Which Subaru Models Made the Switch?

Now that we know Subaru began switching to timing chains around 2010–2012, let’s look at which models were affected. The transition wasn’t immediate or universal. It happened gradually, model by model, as Subaru phased out the older EJ engines and introduced the new FB engines.

2012 Impreza and Crosstrek

One of the first models to get the new FB engine was the 2012 Subaru Impreza. The base 2.0-liter FB20 engine replaced the older EJ20 and EJ25 engines. This marked the first time a mainstream Subaru compact car used a timing chain instead of a belt. The Impreza’s successor, the Crosstrek (introduced in 2013), also came standard with the FB20 engine and a timing chain.

Owners of these models quickly noticed the difference. No more timing belt replacements meant lower maintenance costs and fewer trips to the mechanic. The FB20 engine also delivered better fuel economy—around 30 mpg combined—making it a favorite among commuters and families.

2013 Forester

The 2013 Subaru Forester was another early adopter of the timing chain. The base 2.5-liter FB25 engine replaced the EJ25, bringing with it improved performance and efficiency. The Forester’s timing chain system was designed for long-term reliability, with robust guides and tensioners to minimize wear.

This change was especially welcome for Forester owners, who often drive their vehicles in rugged conditions—mountain roads, snow, and off-road trails. The timing chain’s durability gave them peace of mind, knowing their engine could handle the demands of outdoor adventures.

2015 Legacy and Outback

By 2015, Subaru had fully transitioned the Legacy and Outback to the FB engine family. Both models came standard with the 2.5-liter FB25 engine, which used a timing chain. The larger 3.6-liter EZ36 engine, found in higher trims, still used a timing belt—but that was an exception, not the rule.

The Legacy and Outback are among Subaru’s best-selling vehicles, so this shift had a major impact on the brand’s overall maintenance profile. Owners of these models no longer had to budget for timing belt replacements, which could cost $500–$1,000 every 90,000 miles.

Exceptions: WRX, STI, and Other Models

Not all Subarus made the switch at the same time. Performance models like the WRX and STI continued using timing belts well into the 2010s. The 2015–2021 WRX, for example, used the FA20 turbocharged engine, which still relied on a timing belt. Subaru engineers chose to keep the belt in these high-performance engines for several reasons.

First, timing belts are lighter, which helps reduce rotating mass and improve engine responsiveness—important for sporty driving. Second, turbocharged engines generate more heat and stress, and belts can be easier to service in tight engine bays. Finally, the FA20 engine was derived from the Toyota 86/Subaru BRZ engine, which also used a timing belt.

It wasn’t until the 2022 model year that the WRX finally switched to a timing chain with the new FA24 turbocharged engine. This marked the end of an era for Subaru performance cars and a full transition to chain-driven timing systems across the lineup.

How to Tell If Your Subaru Has a Timing Belt or Chain

If you’re not sure whether your Subaru has a timing belt or chain, don’t worry—you’re not alone. Many owners are surprised to learn that the answer depends on the specific model, engine, and year. Here’s how to find out.

Check the Owner’s Manual

The easiest way to confirm your Subaru’s timing system is to consult the owner’s manual. Subaru clearly states whether the engine uses a timing belt or chain. Look for sections on “Engine Maintenance” or “Scheduled Service.” If the manual mentions a timing belt replacement interval (e.g., “Replace every 105,000 miles”), your car has a belt. If there’s no mention of a belt replacement, it likely has a chain.

Use Your VIN

Another reliable method is to use your Vehicle Identification Number (VIN). You can enter your VIN on Subaru’s official website or use third-party tools like Carfax or AutoCheck to get a detailed vehicle history report. These reports often include engine specifications, including the type of timing system.

Look Under the Hood

If you’re comfortable popping the hood, you can sometimes tell by looking at the engine. Timing belts are usually covered by a plastic or metal cover on the side of the engine block. Timing chains are often hidden behind a larger metal cover and may have oil passages nearby. However, this method isn’t foolproof—some chain-driven engines still have protective covers that look similar to belt covers.

Ask a Mechanic

When in doubt, consult a trusted Subaru mechanic. They can quickly identify your engine type and confirm whether it uses a belt or chain. Many shops offer free inspections, so it’s worth asking during your next oil change.

Maintenance Tips for Timing Chains

Even though timing chains are designed to last the life of the engine, they’re not maintenance-free. Proper care can help prevent premature wear and ensure your Subaru runs smoothly for years to come.

Change Your Oil Regularly

Timing chains rely on engine oil for lubrication. Dirty or low oil can cause increased friction, leading to chain stretch or tensioner failure. Subaru recommends changing the oil every 6,000 miles or 6 months, whichever comes first—especially if you drive in severe conditions (stop-and-go traffic, extreme temperatures, towing).

Use high-quality synthetic oil that meets Subaru’s specifications (e.g., 0W-20 or 5W-30). Avoid cheap or off-brand oils, which may not provide adequate protection.

Listen for Warning Signs

While timing chain failures are rare, they can happen. Watch for these symptoms:

– Rattling noise at startup: A loose or worn chain may rattle for a few seconds when the engine is cold. This is often due to a failing tensioner.
– Check engine light: A stretched chain can cause timing errors, triggering the check engine light. Code P0016 or P0017 may indicate a camshaft/crankshaft correlation issue.
– Rough idle or poor performance: If the chain skips a tooth, it can throw off valve timing, leading to misfires or reduced power.

If you notice any of these signs, have your Subaru inspected immediately. Ignoring the problem can lead to engine damage.

Don’t Skip Other Maintenance

Even with a timing chain, your Subaru still needs regular maintenance. Replace spark plugs, air filters, and coolant as recommended. Keep the engine clean and free of debris. A well-maintained engine is less likely to experience timing system issues.

The Bottom Line: Why the Switch Matters

So, when did Subaru switch to timing chains? The answer is a gradual transition that began around 2010–2012 with the introduction of the FB-series engines. Today, most Subaru models—especially the Impreza, Crosstrek, Forester, Legacy, and Outback—use timing chains instead of belts. Performance models like the WRX joined the trend in 2022.

This shift has had a significant impact on Subaru ownership. Timing chains reduce long-term maintenance costs, improve reliability, and give drivers peace of mind. No more worrying about belt replacements or catastrophic engine failures. For many, it’s one of the best changes Subaru has made in decades.

But it’s not a free pass to neglect your car. Regular oil changes, inspections, and attention to warning signs are still essential. And if you own an older Subaru with a timing belt, don’t forget to replace it on schedule.

Whether you’re buying a new Subaru or maintaining an older one, understanding your timing system is key to a smooth, trouble-free driving experience. Thanks to the switch to timing chains, Subaru owners can enjoy their vehicles with confidence—knowing their engines are built to last.

FAQs

When did Subaru start using timing chains?

Subaru began switching to timing chains around 2010–2012 with the introduction of the FB-series boxer engines. This change started in models like the 2012 Impreza and 2013 Forester.

Do all Subarus have timing chains now?

Most modern Subarus (2012 and newer) have timing chains, especially those with FB-series engines. However, some performance models like the WRX used timing belts until 2022.

How long do Subaru timing chains last?

Timing chains are designed to last the life of the engine—often 200,000 miles or more. With proper maintenance, they rarely need replacement.

Can a Subaru timing chain fail?

Yes, though it’s rare. Failures can occur due to poor oil quality, worn tensioners, or lack of maintenance. Listen for rattling noises or check engine lights.

Do I still need to maintain my Subaru if it has a timing chain?

Absolutely. Regular oil changes, inspections, and following the maintenance schedule are crucial to keep the timing chain and engine in good condition.

How can I tell if my Subaru has a timing belt or chain?

Check your owner’s manual, use your VIN on Subaru’s website, or consult a mechanic. The manual will specify whether your engine uses a belt or chain.

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What is When Did Subaru Switch to Timing Chains??

When Did Subaru Switch to Timing Chains? is an important topic with many practical applications.