Subaru WRX 2018, Owner'S Manual

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Engine
Model
STI Except STI
Engine model
EJ25
(2.5 L, DOHC, turbo)
FA20
(2.0 L, DOHC, turbo)
Engine type Horizontally opposed, liquid cooled 4 cylinder, 4-stroke petrol engine
Displacement cu-in (cc) 150 (2,457) 122 (1,998)
Bore
6
Stroke in (mm) 3.92
6
3.11 (99.5
6
79.0) 3.39
6
3.39 (86.0
6
86.0)
Compression ratio 8.2 : 1 10.6 : 1
Firing order 1
–
3
–
2
–
4
&
Fuel
NOTE
The engine is designed to operate using unleaded gasoline.
Model Fuel Fuel tank capacity
STI
93 AKI (98 RON) or higher *
1
15.9 US gal (60 liters, 13.2 Imp gal)
Except STI 91 AKI (95 RON) or higher *
2
*1: If unleaded gasoline with an octane rating of 93 AKI (98 RON) is not available, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability.
*2: If unleaded gasoline with an octane rating of 91 AKI (95 RON) is not available, unleaded gasoline with an octane rating of 87 AKI (90 RON) or higher
may be used.
Specifications/Specifications
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CONTINUED
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12-3