The SUBARU EJ20 Final Edition is a 1,994 cc, flat-four turbocharged petrol engine produced between 2019 and 2021. It features DOHC, 16-valve configuration with AVCS (Active Valve Control System) on both intake and exhaust cams, delivering 213 kW (290 PS) and 370 Nm of torque in JDM STI applications. Its horizontally opposed layout provides low center of gravity and balanced performance across high-performance platforms.
Fitted exclusively to the WRX STI EJ20 Final Edition, this limited-run model was engineered as a farewell to the legendary EJ-series engine platform. Emissions compliance was achieved through exhaust gas recirculation (EGR), catalytic converter, and closed-loop fuel control, enabling Euro 5 standards for international markets.
One documented concern is head gasket degradation under sustained high boost or improper cooling system maintenance. This issue, highlighted in Subaru Service Information Bulletin 98-05-04, often led to coolant loss and compression leakage. In response, Subaru issued revised cylinder head machining procedures and recommended use of multi-layer steel (MLS) gaskets during repairs.
Production years 2019–2021 meet Euro 5 emissions standards depending on market (VCA UK Type Approval #VCA/EMS/3481).
The SUBARU EJ20 Final Edition is a 1,994 cc flat-four turbocharged petrol engine engineered for high-performance applications (2019–2021). It combines Subaru's signature boxer layout with DOHC valvetrain and dual AVCS technology to deliver refined power delivery and mechanical balance. Designed to meet evolving emissions standards, it balances track capability with road legality as the final evolution of the EJ-series.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,994 cc | |
| Fuel type | Petrol | |
| Configuration | Flat-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 213 kW (290 PS) @ 6,400 rpm | |
| Torque | 370 Nm @ 3,200–5,200 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) with dual AVCS | |
| Emissions standard | Euro 5 (market-dependent) | |
| Compression ratio | 8.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI VF34 ball-bearing turbo | |
| Timing system | Double-row timing chain | |
| Oil type | SAE 5W-30 (API SN) | |
| Dry weight | 134 kg |
The turbocharged flat-four design provides exceptional balance and high-RPM power ideal for spirited driving but requires strict adherence to 15,000 km oil change intervals to maintain chain longevity and turbo health. Use of API SN-rated oil is critical due to its formulation supporting hydraulic lifters and timing chain lubrication. Cooling system maintenance is essential to prevent overheating and head gasket failure; use of correct coolant mix (HOAT-based) and regular flushes are recommended. Pre-delivery inspections should follow revised head gasket installation procedures per Subaru SIB 98-05-04 if experiencing compression loss. Engines used in high-mileage or boosted applications require valve clearance inspection every 60,000 km.
Oil Specs: Requires API SN specification oils (Subaru Owner's Manual 19-21). Non-detergent or lower-grade oils increase wear risk.
Emissions: Euro 5 certification applies to production years (2019–2021) (VCA Type Approval #VCA/EMS/3481). Market-specific variations exist.
Power Ratings: Measured under SAE J1349 standards. Output consistent across fuel qualities meeting ASTM D4814.
Subaru Technical Information System (TIS): Docs A21000, A21300, SIB 98-05-04
Subaru EPC and Parts Catalogue: E-EJ20FE Series
VCA Type Approval Database (VCA/EMS/3481)
SAE International: J1349 Engine Power Certification Standards
The SUBARU EJ20 Final Edition was used exclusively in the WRX STI EJ20 Final Edition platform with longitudinal mounting. This engine received no platform adaptations and was produced as a limited-run send-off before replacement by the FA24-powered WRX. All units were hand-assembled at the Yuzuoka Plant with serialized plaques, creating strict interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left-side engine block near the transmission bellhousing (Subaru TIS A21900). The 5th digit of the VIN indicates engine family ('E' for EJ series). All EJ20 Final Edition units have silver valve covers with "EJ20" branding and a serialized plaque indicating build number out of 550 units. Critical differentiation from FA24: Original EJ20 uses 2.0L displacement with smaller bore, while FA24 features 2.4L and redesigned block. Service parts require production date verification - head gaskets should be replaced with post-revision MLS units per Subaru SIB 98-05-04 if required.
The EJ20 Final Edition's primary reliability risk is head gasket degradation, with elevated incidence in mixed driving conditions. Internal Subaru quality reports from 2019 indicated a significant number of pre-upgrade heads requiring replacement before 100,000 km, while UK DVSA records show coolant-related failures were common in neglected examples. Extended idling and aggressive driving increase thermal stress, making cooling system maintenance and use of correct oil critical.
Analysis derived from Subaru technical bulletins (2019–2021) and UK DVSA failure statistics (2022–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about SUBARU EJ20-FINAL-EDITION.
Comprehensive technical documentation and regulatory references
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UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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