Do Subaru engines last long?

Yes. Subarus can run for many miles with proper maintenance, and a substantial portion of owners report 200,000 miles or more. Longevity varies by engine family, model year, and how well the vehicle is cared for, with older EJ-series engines more prone to head-gasket issues if neglected, while newer FA/FB engines generally show strong reliability.

How long Subarus tend to last

Subaru’s flat-four and flat-six engines are designed for durability, with the boxer layout distributing wear more evenly and reducing vibration. With routine maintenance, many engines reach or exceed two hundred thousand miles. Actual lifespans depend on climate, usage patterns, and service history.

Engine families and reliability considerations

Two broad families dominate the discussion: the legacy EJ-series 2.0/2.5 engines and the newer FA/FB-series engines. The EJ-family has a reputation for head-gasket vulnerabilities as they age, especially in high-mileage or poorly maintained examples. The FA/FB engines introduced in the late 2010s bring design refinements aimed at improving coolant sealing and overall reliability, contributing to stronger long-term durability when properly serviced.

Additionally, turbocharged variants—found in models like certain WRX and STI configurations—tend to demand more meticulous maintenance due to higher stresses and temperatures, which can influence long-term life if neglected.

What affects engine longevity

Several practical factors determine how long a Subaru engine will perform. The following list highlights the major influences:

• Maintenance history and adherence to service intervals


• Driving conditions (frequent short trips vs. steady highway use)


• Quality of oil and timely oil changes (synthetic vs. conventional)


• Cooling system integrity (coolant condition, radiator, water pump, hoses)


• Head gasket health on older EJ-series engines


• Prompt diagnosis and repair of oil consumption, misfires, or coolant leaks


• Quality of parts and workmanship in repairs

In practice, careful maintenance is the best predictor of a long-lived engine.

Maintenance practices to maximize longevity

To maximize engine life, follow manufacturer-recommended maintenance and adopt proactive habits. The following actions are widely advised:

• Change oil at the recommended intervals with high-quality synthetic oil and the correct viscosity


• Replace the oil filter with every oil change and monitor oil consumption


• Maintain the cooling system: regular coolant flushes, inspect for leaks, replace worn hoses and the water pump as needed


• Follow the engine’s timing belt/chain interval (note that newer FA/FB engines use a chain; older EJ engines typically used a belt)


• Monitor for oil leaks, consumption, or abnormal exhaust and address promptly


• Keep spark plugs, ignition coils, and fuel injectors in good condition to prevent misfires and extra engine stress


• Address head gasket issues early with prompt diagnostics if symptoms arise

With diligent upkeep, Subaru engines can deliver many years of reliable service.

Summary

Subaru engines are widely regarded as durable, especially when properly maintained. While older EJ-series 2.5L engines have well-documented head-gasket vulnerabilities, newer FA/FB engines generally offer improved reliability. Across engine families, regular oil changes, cooling-system upkeep, and timely repairs remain the most dependable predictors of long-term longevity. Many Subaru owners routinely surpass 200,000 miles, and with proper care, reaching 300,000 miles is within the realm of possibility.

How reliable are Subaru engines?

Subaru engines are generally considered reliable, with many drivers getting over 200,000 miles with proper maintenance. While older models had a known head gasket issue that has since been resolved in newer generations, modern Subaru engines face other potential problems like oil consumption in some FB series models and direct injection-related valve deposits, though these are manageable with regular checks and maintenance. 
Positive aspects of Subaru engine reliability

• High longevity: With proper care, many Subaru engines last well beyond 200,000 miles. 
• Engine improvements: Subaru has continuously refined its boxer engines, leading to improved reliability in newer generations. The FB series, found in many current models, is praised by sources like Consumer Reports for good predicted reliability. 
• Improved design: Newer engines have revised head gaskets and other updates to address previous weaknesses. 

Potential issues to be aware of

• Older head gasket issues: While fixed in later models, earlier EJ25 engines were prone to head gasket failure. 
• Oil consumption: Some FB series engines have been known to consume excessive oil, which can be mitigated by regularly checking oil levels. 
• Direct injection valve deposits: Like many direct-injection engines, some modern Subarus can develop carbon buildup on the intake valves. This is more of a maintenance concern, often addressed with proper care. 
• Ticking noises: Some six-cylinder boxer engines have been known to exhibit ticking noises. 

Tips for maintaining reliability

• Follow the maintenance schedule: Adhere to the manufacturer's recommended service intervals for things like oil changes and fluid checks. 
• Check fluid levels regularly: Keep a close eye on oil and coolant levels. 
• Change fluids on time: Replace fluids as recommended, especially the fluids in CVT transmissions, which may require more frequent changes. 
• Replace the PVC valve: Replacing the PVC valve at recommended intervals can help prevent oil leaks. 

What years did Subaru have a bad engine?

Although Subaru has been challenged with engine issues, most of the issues were isolated to a few engines, namely the EJs that were in the Impreza, Forester, Legacy, Outback and Baja models between 1996 and 2005. The latest Subaru boxer engines are part of the FB series boxer engines.

Can Subarus last 300,000 miles?

On average, a well-maintained Subaru Outback can last anywhere from 200,000 to 300,000 miles!

What is the biggest problem with Subaru engines?

One of the most notorious issues plaguing Subaru vehicles is head gasket leaks, particularly in older models with the EJ series engines. These leaks can lead to coolant loss, overheating, and potential engine damage if left untreated.