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The Specs and Reliability of the Subaru EJ25 Engine - Part 2 -

The Specs and Reliability of the Subaru EJ25 Engine - Part 2

Continuing where we left off, we will now delve into the reliability of the EJ25 engine, as well as common issues and preventative maintenance.

Common Issues and Problems

No engine is perfect, and the EJ25 is no exception. Some common issues that EJ25 owners have reported include head gasket failures, ringland failures, oil consumption issues, and timing belt and water pump failures. Let's take a closer look at each of these issues.

Head Gasket Failures

The head gaskets can fail due to a variety of reasons, including overheating, age, and inadequate maintenance. Signs of a failing head gasket include loss of coolant, overheating, and white exhaust smoke.

Ringland Failures

Another common issue with the EJ25 engine is ringland failure. The ringlands are the areas on the pistons where the piston rings are located. If they fail, you may experience catastrophic engine damage. Symptoms of ringland failure include a knocking sound from the engine and reduced engine performance.

Oil Consumption Issues

Some EJ25 owners have reported excessive oil consumption. The engine may burn oil more quickly than expected, leading to the need for frequent oil changes. Symptoms of excessive oil consumption include low oil levels, engine knocking, and decreased engine performance.

Timing Belt and Water Pump Failures

The EJ25 engine is an interference engine, meaning that if the timing belt fails, it can cause significant engine damage. The water pump is also a critical component that can fail and cause overheating. Replacing the timing belt and water pump at regular intervals is recommended to prevent these issues.

Preventative Maintenance and Repair

Preventative maintenance is crucial to keep the EJ25 engine running smoothly and to prevent issues such as those mentioned above. It is recommended to follow the manufacturer's maintenance schedule, which includes regular oil changes, timing belt and water pump replacement, and other recommended services.

Recommended Maintenance Intervals

Subaru recommends changing the oil every 6,000 miles or six months (we recommend every 4,000 miles or four months), whichever comes first. The timing belt and water pump should be replaced every 105,000 miles, and the spark plugs should be replaced every 60,000 miles.

Common Repairs and Replacement Parts

In addition to regular maintenance, some common repairs for the EJ25 engine would focus on counteracting the problems mentioned above, like head gasket replacement, ringland repair, and timing belt and water pump replacement. Replacement parts for the EJ25 engine are widely available, and many Subaru owners choose to do their own repairs.

Importance of Regular Maintenance and Repair

Regular maintenance and repair are critical to the longevity and reliability of the EJ25 engine. Neglecting maintenance can lead to many issues. By following the manufacturer's maintenance schedule and addressing any issues promptly, owners can ensure that their EJ25 engine lasts for many years.

Longevity and Durability

The EJ25 engine is known for its longevity and durability, with many owners reporting high mileage without major issues. Let's take a closer look at what to expect in terms of engine life.

Mileage Expectations

The EJ25 engine is capable of lasting up to 200,000 miles or more with proper maintenance and care. Many owners report reaching 300,000 miles or more with their EJ25 engines.

Factors that Can Affect Engine Life

Several factors can affect the life of the EJ25 engine, including driving habits, maintenance, and environmental factors. Hard driving refers to the frequent high-speed driving or aggressive acceleration that can wear out the engine more quickly. Environmental factors such as extreme heat or cold can also affect engine performance and longevity.


Overall, the Subaru EJ25 engine is a reliable and durable engine that can last for many years with proper maintenance and care. While there are some common issues and problems, these can be addressed with regular maintenance and prompt repairs.

When purchasing a used Subaru with an EJ25 engine, it is important to consider the maintenance history and any potential issues that may arise. By following the manufacturer's maintenance schedule and addressing any problems promptly, owners can ensure that their engines will last for many years.

If you are looking for a great source of Subaru engine add-ons online, look no further than our amazing selection here at Subimods. We are the leading supplier of Subaru performance parts, aftermarket parts, replacement parts, and accessories. Check out our online store for more of our available car parts and their prices.

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