Subaru 2.5L H4 Engine Specifications
The Subaru 2.5L H4 engine, also known as the EJ25, is a popular engine configuration that has been utilized in various Subaru models. This engine is renowned for its reliability, performance, and versatility. Below are the detailed specifications of the Subaru 2.5L H4 engine.
| Specification | Details |
|---|---|
| Engine Type | 4-cylinder, Horizontally Opposed (Boxer) |
| Displacement | 2.5 liters (2457 cc) |
| Fuel System | Multi-Point Fuel Injection (MPFI) |
| Compression Ratio | 10.5:1 |
| Maximum Horsepower | 170 hp @ 5,800 rpm |
| Maximum Torque | 174 lb-ft @ 4,100 rpm |
| Valvetrain | DOHC, 16 valves |
| Fuel Type | Regular Unleaded (87 octane) |
| Engine Weight | Approximately 330 lbs (150 kg) |
Engine Configuration
The Subaru 2.5L H4 engine features a unique engine configuration that sets it apart from traditional inline engines. The horizontally opposed design, commonly referred to as a “Boxer” engine, offers several advantages:
- Lower Center of Gravity: The flat design of the engine contributes to a lower center of gravity, enhancing vehicle stability and handling.
- Reduced Vibration: The opposing pistons help to balance out engine vibrations, resulting in a smoother operation.
- Compact Size: The engine’s design allows for a more compact engine bay, providing additional space for other components.
The 2.5L H4 engine is commonly found in various Subaru models, including the Subaru Outback, Legacy, Forester, and Impreza. Its robust design and performance characteristics make it a popular choice for both daily driving and off-road adventures.
Engine Oil Specifications
Proper engine oil selection and maintenance are crucial for the longevity and performance of the Subaru 2.5L H4 engine. Below are the recommended engine oil specifications:
| Specification | Details |
|---|---|
| Oil Type | Synthetic 5W-30 or 10W-30 |
| Oil Capacity (with filter) | 5.1 quarts (4.8 liters) |
| Oil Filter | Subaru OEM or equivalent |
Oil Change Intervals
Maintaining the correct oil change intervals is essential for optimal engine performance. The following guidelines are recommended:
- For normal driving conditions: Change the oil every 6,000 miles or 6 months, whichever comes first.
- For severe driving conditions (e.g., towing, off-road driving, extreme temperatures): Change the oil every 3,000 to 4,000 miles.
Service Intervals
Regular maintenance is vital for ensuring the Subaru 2.5L H4 engine operates efficiently. Below is a list of recommended service intervals:
| Service Item | Interval |
|---|---|
| Oil Change | 6,000 miles or 6 months (normal conditions) |
| Air Filter Replacement | 15,000 to 30,000 miles |
| Fuel Filter Replacement | 30,000 miles |
| Spark Plug Replacement | 60,000 miles |
| Coolant Replacement | 30,000 miles or every 2 years |
| Timing Belt Replacement | 105,000 miles |
Conclusion
The Subaru 2.5L H4 engine is a well-engineered powerplant that provides a balance of performance, reliability, and efficiency. Understanding its specifications, engine configuration, oil requirements, and service intervals is essential for maintaining the engine’s health and ensuring a long lifespan. Regular maintenance and adherence to recommended service intervals will help keep the engine running smoothly, providing an enjoyable driving experience for years to come.
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