FB25 Engine

FB25 Engine Specs

Manufacturer Gunma Oizumi Plant
Also called Subaru FB25
Production 2010-present
Cylinder block alloy Aluminum
Configuration Flat-4
Valvetrain DOHC
4 valves per cylinder
Piston stroke, mm (inch) 90 (3.54)
Cylinder bore, mm (inch) 94 (3.70)
Compression ratio 10.0
10.3 (2014+)
Displacement 2498 cc (152.4 cu in)
Power output 127 kW (172 HP) at 5,800 rpm
129 kW (175 HP) at 5,800 rpm
Torque output 236 Nm (174 lb·ft) at 4,100 rpm
235 Nm (173 lb·ft) at 4,000 rpm
Redline 6,000
HP per liter 68.9
70.0
Fuel type Gasoline
Weight, kg (lbs)
Fuel consumption, L/100 km (mpg)
-City
-Highway
-Combined
Subaru Forester 2.5
10.9 (21)
6.8 (34)
8.3 (28)
Turbocharger  Naturally aspirated
Oil consumption , L/1000 km
(qt. per miles)
up to 1.0
(1 qt. per 600 miles)
Recommended engine oil 0W-20
5W-20
5W-30
5W-40
Engine oil capacity, L (qt.) 4.8 (5.1)
Oil change interval, km (miles) 5,000-10,000
(3,000-6,000)
Normal engine operating temperature, °C (F)
Engine lifespan, km (miles)
-Official information
-Real

300,000+ (180,000)
Tuning, HP
-Max HP
-No life span loss
180+

FB25 Engine Problems and Reliability

The FB25 has no issues with high oil consumption instead of the FB20. The lifespan of the maintenance free timing chains and associated systems (slider, tensioner, etc.) is designed to be about the same as the useful lifespan of the engine itself. The engine is good and reliable, lifespan is about 200,000 miles.

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