The Alfa Romeo AR36301 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2023 and 2028. It forms part of Alfa Romeo's modern GSE (Global Small Engine) family, co-developed within the Stellantis group, featuring direct fuel injection, dual variable valve timing (Dual VVT), and a compact twin-scroll turbocharger. In standard tune it delivers 240 kW (326 PS), with peak torque of 450 Nm available from 2,500 rpm, providing high-performance driving dynamics.
Fitted to key models including the Giulia Quadrifoglio, Stelvio Quadrifoglio, and select high-performance Tonale variants, the AR36301 was engineered for track-capable performance with improved thermal efficiency and emissions control. Emissions compliance is achieved through a three-way catalytic converter, closed-loop lambda control, and gasoline particulate filter (GPF), meeting Euro 6d-Full standards across its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear, identified in Alfa Romeo Service Information Bulletin 102/2026. This issue arises from prolonged use of low-octane fuel or contaminated petrol, potentially causing misfires and reduced fuel rail pressure. From 2026, revised fuel pump materials and updated ECU mapping were implemented to enhance durability.
All production years 2023–2028 meet Euro 6d-Full emissions standards (VCA UK Type Approval #VCA/EMS/10201).
The Alfa Romeo AR36301 is a 1,995 cc inline-four turbocharged petrol engine engineered for high-performance vehicles (2023–2028). It combines direct fuel injection with dual variable valve timing and a twin-scroll turbocharger to deliver strong mid-range torque and rapid throttle response. Designed to meet Euro 6d-Full standards, it integrates a gasoline particulate filter (GPF) to reduce particulate matter emissions.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 88.3 mm × 81.4 mm | |
| Power output | 240 kW (326 PS) @ 6,500 rpm | |
| Torque | 450 Nm @ 2,500–4,500 rpm | |
| Fuel system | Direct injection (up to 350 bar) with GPF | |
| Emissions standard | Euro 6d-Full | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll turbo with electronic wastegate | |
| Timing system | Chain-driven (DOHC) | |
| Oil type | SAE 0W-20, ACEA C5 specification | |
| Dry weight | 145 kg |
The twin-scroll turbo provides strong mid-range torque ideal for spirited driving, but demands adherence to 15,000 km oil service intervals using ACEA C5 0W-20 oil to prevent turbo bearing and timing chain wear. Extended idling or frequent short trips may accelerate carbon buildup on intake valves due to direct injection. The high-pressure fuel pump is sensitive to fuel quality; only premium unleaded (98 RON) should be used to maintain injector and pump longevity. From 2026, updated fuel pump hardware with improved materials (per SIB 102/2026) should be used in repairs. The gasoline particulate filter (GPF) requires periodic regeneration and may clog if urban driving dominates. The engine management system requires OBD-II-compliant diagnostics for adaptation resets.
Oil Specs: Requires SAE 0W-20 meeting ACEA C5 specification (Alfa Romeo SIB 102/2026). Compatible with Fiat 9.55535-S4 and API SP+.
Emissions: Euro 6d-Full certification applies to all models 2023–2028 (VCA Type Approval #VCA/EMS/10201). No market-specific variants.
Power Ratings: Measured under ECE R85 standards. Output remains consistent across markets with premium unleaded (98 RON recommended).
Alfa Romeo Technical Information System (TIS): Docs A36301-ENG-01, A36301-TUR-02, SIB 102/2026
VCA Type Approval Database (VCA/EMS/10201)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo AR36301 was used across Alfa Romeo's 952/956 platforms with longitudinal mounting in rear-wheel-drive and all-wheel-drive applications. This engine received model-specific tuning—slightly higher boost pressure in the Giulia Quadrifoglio for performance alignment—and from 2025, the Tonale hybrid variant adopted a downsized version (AR33205), creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the starter motor (Alfa Romeo TIS A36301-ID-10). The 8th VIN digit indicates engine type ('J' for AR36301 series). Pre-2026 models have a black-topped intake manifold with silver turbo housing; post-2026 units retain the same layout but feature revised fuel pump labeling. Critical differentiation from hybrid AR33205: AR36301 uses a single IHI turbo with electronic actuator, while AR33205 employs a smaller BorgWarner unit with integrated electric assist. Service parts require VIN-based verification—fuel pumps before 06/2026 are incompatible with later models due to control signal revisions (Alfa Romeo SIB 102/2026).
The AR36301's primary reliability risk is high-pressure fuel pump wear, with elevated incidence in vehicles fueled with substandard petrol or operated under sustained high-load conditions. Internal Alfa Romeo field reports from 2027 indicated a measurable share of pre-2026 units required fuel pump replacement before 130,000 km, while UK DVSA data links a portion of emissions-related failures to GPF clogging in urban environments. Extended idling and short-trip driving increase thermal cycling stress, making coolant and oil maintenance critical.
Analysis derived from Alfa Romeo technical bulletins (2023-2028) and UK DVSA failure statistics (2025-2028). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR36301.
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