The EJ25 engine, which had a displacement of 2.5 liters, was launched by Subaru in 1995. The block of this engine was identical to the block of the EJ20 engine – just like its older brother, it was made of aluminum alloy and had a height of 201 mm. The only difference was in the diameter of the cylinders – unlike the 2.0-liter engine, which had 92 mm, the 2.5-liter engine had 99.5 mm. The block housed a crankshaft with a piston stroke of 79 mm. The length of the connecting rods was 130.5 mm, and the piston height was 30.7 mm.
Specifications
| Manufacturer | Gunma Oizumi Plant |
| Also called | EJ25 |
| Production years | 1996 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | boxer engine |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 79 |
| Cylinder bore, mm | 99.5 |
| Compression ratio | 8.2 (EJ257) 8.4 (EJ255) 8.7 (EJ257) 9.5 (EJ25D 1996) 9.7 (EJ25D 1997-1999) 10.1 (EJ251/EJ252/EJ253) 10.7 (EJ254) |
| Displacement, cc | 2457 |
| Power output, hp | 155/5600 165/5600 165/5600 173/5600 170/6000 210/5600 230/5600 250/6000 265/6000 280/5600 300/6000 |
| Torque output, Nm / rpm | 190/2800 220/4000 226/4400 225/4000 238/2800 320/3600 320/3600 339/3600 347/2800 392/4000 407/4000 |
| Fuel type | 95-98 |
| Euro standards | — |
| Weight, kg | ~120 |
| Fuel consumption, L/100 km (for WRX STI VA) — city — highway — combined |
14.0 8.4 10.4 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 0W-30 / 5W-30 / 5W-40 / 10W-30 / 10W-40 |
| Engine oil capacity, liter | 4.0 (EJ25D, EJ25 2007+) 4.5 (2000-2007) 4.3(WRX/STI 2000+) |
| Oil change interval, km | 15000 (better 7500) |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 250+ |
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