Engine Subaru FB25

The 2.5-liter Subaru FB25B gasoline engine has been assembled at the company’s plant since 2010 and is installed on mid-size models of the concern, such as Legacy and Forester. The unit was upgraded in 2018 and changed from multipoint fuel injection to direct.

The FB family also includes internal combustion engines: FB16 and FB20.

The engine was installed on:

  • Subaru Forester 2 in 2010 – 2013;
  • Subaru Forester 3 (SH) in 2012 – 2018;
  • Subaru Forester 4 (SJ) since 2018;
  • Subaru Legacy 5 (BM) in 2012 – 2015;
  • Subaru Legacy 6 (BN) in 2014 – 2019;
  • Subaru Legacy 7 (BW) since 2019;
  • Subaru Exiga 1 (YA) in 2012 – 2015.

Specifications

Production years since 2010
Displacement, cc 2498
Fuel system distributed injection (until 2018)
direct injection (after 2018)
Power output, hp 172 – 175 (until 2018)
185 (after 2018)
Torque output, Nm 235 (until 2018)
240 (after 2018)
Cylinder block aluminum H4
Block head aluminum 16v
Cylinder bore, mm 94
Piston stroke, mm 90
Compression ratio 10 – 10.3 (until 2018)
12.0 (after 2018)
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator Dual AVCS
Turbocharging no
Recommended engine oil 0W-20
Engine oil capacity, liter 4.8
Fuel type 95
Euro standards EURO 5 (until 2018)
EURO 6 (after 2018)
Fuel consumption, L/100 km (for Subaru Legacy 2017)
— city
— highway
— combined
10.1
6.2
7.7
Engine lifespan, km ~250 000
Weight, kg 150

Disadvantages of the FB25 engine

  • Unlike the 2-liter counterparts, this engine is not famous for its strong oil consumption;
  • But it is also demanding on the quality of the lubricant, otherwise the phase regulators will fail;
  • The cooling system is not very reliable, and the engine is extremely afraid of overheating;
  • Malfunctions in the operation of the electronic throttle lead to floating speed;
  • Even with a slight drop in the level of lubrication, the motor may begin to make noise and knock.

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