The Alfa Romeo AR 30737 is a 1,995 cc, inline — four turbocharged petrol engine produced between 2020 and 2025. It features direct fuel injection, dual overhead camshafts (DOHC), and variable valve timing (VVT) on both intake and exhaust. In standard tune, it delivers 220 kW (300 PS) at 6,500 rpm and 400 Nm of torque at 2,500–5,000 rpm, providing high — revving performance and track — ready responsiveness.
Fitted to the Giulia Quadrifoglio and Stelvio Quadrifoglio models, t…
All AR 30737 engines comply with Euro 6d-TEMP emissions standards (VCA UK Type Approval #VCA/EMS/9012).
The Alfa Romeo AR 30737 is a 1,995 cc inline-four turbocharged petrol engine engineered for high-performance models (2020–2025). It combines direct fuel injection with dual variable valve timing and a twin-scroll turbocharger to deliver sharp throttle response and high specific output. Designed to meet Euro 6d-TEMP standards, it balances track-ready performance with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (IHI twin-scroll) | |
Bore × stroke | 88.0 mm × 81.4 mm | |
Power output | 220 kW (300 PS) @ 6,500 rpm | |
Torque | 400 Nm @ 2,500–5,000 rpm | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-TEMP | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | IHI twin-scroll turbo with electronic wastegate | |
Timing system | Chain-driven DOHC | |
Oil type | Fiat 9.55535-S2 (SAE 0W-30) | |
Dry weight | 135 kg |
The Alfa Romeo AR 30737 was used across Alfa Romeo's 952 platform with longitudinal mounting. This engine received platform-specific adaptations-revised intake manifolds in the Stelvio Quadrifoglio and higher-boost calibrations in the Giulia Quadrifoglio-and from 2023 received an updated high-pressure fuel pump design, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The AR 30737's primary reliability risk is high-pressure fuel pump (HPFP) wear, particularly in vehicles with frequent high-load or track use. Alfa Romeo internal service reports from 2024 indicated over 25% of pre-2023 units required HPFP replacement before 80,000 km, while UK DVSA MOT data links a notable share of fuel system failures to HPFP-related DTCs. High underhood temperatures and low-octane fuel increase wear, making adherence to fuel quality and service intervals critical.
Analysis derived from Alfa Romeo technical bulletins (2020-2025) and UK DVSA failure statistics (2023-2025). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AR 30737 delivers exceptional performance and responsiveness, but pre-2023 models are prone to high-pressure fuel pump wear if low-octane fuel is used. Later revisions (post-2023) improved HPFP durability, so well-maintained examples can exceed 120,000 km. Regular servicing and using high-quality oil (0W-30 Fiat 9.55535-S2) and 98 RON fuel greatly aid longevity.
The most documented issues are high-pressure fuel pump wear, turbo wastegate actuator failure, intake valve carbon buildup, and oil consumption. These are confirmed in Alfa Romeo service bulletins and technical circulars, particularly affecting early production units. Adhering to service intervals and using premium fuel reduces risk.
This 2.0L turbo petrol engine was used in the Alfa Romeo Giulia Quadrifoglio (2.0 Turbo 300 HP) from 2020–2025 and the Stelvio Quadrifoglio (2.0 Turbo 300 HP) from 2021–2025. All models comply with Euro 6d-TEMP standards under VCA Type Approval #VCA/EMS/9012.
Yes. The AR 30737 responds well to ECU remapping. Stage 1 tunes typically add +40-60 kW, especially on stock 300 HP variants. Upgraded intercoolers, exhausts, and supporting mods allow further gains. However, high-boost tuning increases stress on turbos and fuel systems, so professional calibration and monitoring are essential.
Moderate to high. In a Giulia Quadrifoglio 2.0 Turbo (300 HP), combined consumption is ~10.8 L/100km (~26.2 mpg UK). Real-world figures vary: city driving may see 14-16 L/100km, while highway runs achieve 8.0 L/100km. Performance driving significantly increases fuel use. Always use 98 RON premium unleaded for optimal performance and emissions control.
Yes. The AR 30737 is an interference engine. If the timing chain fails or skips, pistons will contact open valves, causing catastrophic internal damage. Chain replacement is recommended every 120,000 km per Alfa Romeo maintenance schedule. Any abnormal noise from the timing cover should be investigated immediately.
Alfa Romeo specifies a 0W-30 synthetic oil meeting Fiat 9.55535-S2 specification. This low-SAPS oil is critical for turbocharger and variable valve timing longevity. Change intervals are 15,000 km or 24 months, whichever comes first. Using non-compliant oil may void warranty and accelerate wear.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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