Mass production of the EJ series engines began back in 1989. The first car to receive the 2.0L EJ20 powerplant was the Subaru Legacy. This engine replaced the outdated EA82 engine with a volume of 1.8 liters. The base of the EJ20 was a 201 mm high boxer block made of aluminum alloy with four cylinders with a diameter of 92.0 mm, cased with a material of cast iron. Crankshaft with 75.0 mm stroke.
Specifications
| Manufacturer | Gunma Oizumi Plant |
| Also called | EJ20 |
| Production years | 1989 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | boxer engine |
| Number of cylinders | 4 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 75 |
| Cylinder bore, mm | 92 |
| Compression ratio | 8.0 (EJ205 WRX/EJ207/EJ20G/EJ20K) 8.5 (EJ205 Forester/EJ208) 9.0 (EJ205 WRX 2002+/EJ206/EJ208) 9.5 (EJ20X/EJ20Y) 9.7 (EJ20J) 10.0 (EJ204 Impreza II) 10.1 (EJ201/EJ202/EJ20D) 10.2 (EJ204 Impreza III) |
| Displacement, cc | 1994 |
| Power output, hp | 125/5500 135/5600 137/5600 140/5600 155/6400 160/6400 180/6800 190/7100 200/6000 220/6400 230/5600 240/6000 250/6000 260/6000 260/6500 275/6500 280/6500 308/6400 320/6400 328/7200 |
| Torque output, Nm / rpm | 172/4500 181/4000 186/3600 186/4400 196/3200 186/3200 196/4400 196/4400 260/3600 270/4000 319/2800 309/4000 334/3600 319/5000 309/5000 319/4000 343/5000 430/4400 384/4400 431/4800 |
| Fuel type | 95-98 |
| Euro standards | — |
| Weight, kg | 147 (EJ20G) |
| Fuel consumption, L/100 km (for Impreza WRX STI GD) — city — highway — combined |
16.7 9.5 12.1 |
| 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 (1993-2007) 4.2 (2007+) 4.5 (WRX/STI 1993-2000) 5.0 (WRX/STI 2000-2007) |
| Oil change interval, km | 15000 (better 7500) |
| Normal engine operating temperature, °C | — |
| Engine lifespan, km — official information — real |
— 250+ |
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