Subaru EJ25 Engine Specifications
The Subaru EJ25 engine is a popular flat-four (boxer) engine that has been used in various Subaru models since the late 1990s. Known for its unique design and performance characteristics, the EJ25 engine has garnered a reputation for reliability and efficiency. Below are the detailed specifications of the EJ25 engine.
| Specification | Details |
|---|---|
| Engine Type | 4-cylinder, horizontally opposed (boxer) |
| Displacement | 2.5 liters (2457 cc) |
| Bore x Stroke | 99.5 mm x 79.0 mm |
| Compression Ratio | 10.5:1 |
| Max Horsepower | 165 hp @ 5800 rpm |
| Max Torque | 166 lb-ft @ 4000 rpm |
| Fuel System | Multi-Point Fuel Injection (MPFI) |
| Ignition System | Distributor-less Ignition System (DIS) |
| Fuel Type | Regular unleaded gasoline (87 octane) |
| Cooling System | Liquid-cooled |
| Weight | Approximately 350 lbs (159 kg) |
Engine Configuration
The Subaru EJ25 engine features a horizontally opposed configuration, commonly referred to as a “boxer” engine. This design offers several advantages:
- Lower Center of Gravity: The flat design helps lower the vehicle’s center of gravity, enhancing stability and handling.
- Reduced Vibration: The opposing pistons cancel out vibrations, resulting in a smoother operation compared to inline engines.
- Compact Size: The engine’s layout allows for a more compact design, which can contribute to better weight distribution in vehicles.
The EJ25 engine is typically mated to either a 5-speed manual or a continuously variable transmission (CVT), depending on the model and trim level. This versatility allows for a range of driving experiences, from sporty performance to fuel-efficient commuting.
Engine Oil Specifications
Proper maintenance of the EJ25 engine includes using the correct engine oil. The specifications for engine oil are crucial to ensure optimal performance and longevity.
| Specification | Details |
|---|---|
| Oil Type | Synthetic or Conventional |
| Viscosity | 5W-30 or 10W-30 |
| Oil Capacity (with filter) | 5.5 quarts (5.2 liters) |
| Oil Filter | Subaru OEM or equivalent |
Service Intervals
Regular maintenance is essential for the longevity and performance of the Subaru EJ25 engine. Below are the recommended service intervals for oil changes and other essential maintenance tasks.
Oil Change Intervals
- Every 6,000 miles or 6 months, whichever comes first.
- For severe driving conditions (e.g., towing, off-road, extreme temperatures), consider changing the oil every 3,000 to 4,000 miles.
Other Maintenance Tasks
In addition to regular oil changes, the following maintenance tasks should be performed at specified intervals:
- Air Filter Replacement: Every 15,000 to 30,000 miles, depending on driving conditions.
- Spark Plug Replacement: Every 60,000 miles for standard plugs; every 100,000 miles for iridium plugs.
- Coolant Flush: Every 30,000 miles or as needed.
- Transmission Fluid Change: Every 30,000 to 60,000 miles, depending on the type of transmission.
Conclusion
The Subaru EJ25 engine is a well-engineered powerplant that combines performance, reliability, and efficiency. Understanding its specifications, engine configuration, oil requirements, and service intervals is essential for maintaining the engine’s health and ensuring optimal performance over time. By adhering to the recommended maintenance schedule and using the appropriate engine oil, Subaru owners can enjoy a smooth and reliable driving experience for many years.
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