Engine Subaru FB25

Engine Subaru FB25

The FB25 boxer engine is an aluminum 6-cylinder injector with a nominal displacement of 2498 “cc” and a pair of light cylinder heads, each equipped with two camshafts. Gas distribution scheme – 16-valve DOHC, compression in the range of 10.0-10.3 (after 2014). The camshafts use a dual AVCS system, each driven by a maintenance-free timing chain. Experts recommend buying a used FB25 engine after 2014, when it was modified.


Manufacturer Gunma Oizumi Plant
Also called FB25
Production years 2010
Cylinder block alloy aluminum
Fuel system injector
Configuration boxer engine
Number of cylinders 4
Valves per cylinder 4
Piston stroke, mm 90
Cylinder bore, mm 94
Compression ratio 10.0
10.3 (2014+)
Displacement, cc 2498
Power output, hp 172/5800
Torque output, Nm / rpm 236/4100
Fuel type 95
Euro standards
Weight, kg
Fuel consumption, L/100 km (for Forester)
— city
— highway
— combined
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 0W-20 / 5W-20 / 5W-30 / 5W-40
Engine oil capacity, liter 4.8
Oil change interval, km 15000
(better 7500)
Normal engine operating temperature, °C
Engine lifespan, km
— official information
— real


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