The Alfa Romeo 939 A5.000 is a 1,742 cc, inline-four petrol engine produced between 2015 and 2023. It forms part of the MultiAir II engine family, featuring variable valve timing and electro-hydraulic valve actuation for improved efficiency and responsiveness. Delivering 121–140 kW (165–190 PS) and up to 330 Nm of torque, it provides strong mid-range performance ideal for sporty driving dynamics.
Fitted to models including the Giulietta (940), Giulia (952), and Stelvio (956), the 939 A5.000 was engineered for a balance of spirited performance and urban drivability. Emissions compliance is achieved through integrated exhaust manifolds, cooled EGR, and dual three-way catalytic converters, enabling Euro 6b compliance across its production run.
One documented concern involves premature turbocharger bearing wear observed in early 2016–2017 Giulia models, highlighted in Alfa Romeo Technical Bulletin 57/2018. The issue was linked to oil coking in high-temperature zones due to inadequate warm-up/cool-down cycles. From 2018 onward, revised oil cooler routing and updated turbocharger hardware were implemented to mitigate the risk.
All production years 2015–2023 meet Euro 6b emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Alfa Romeo 939 A5.000 is a 1,742 cc inline-four petrol engine engineered for compact and mid-size performance models (2015–2023). It combines MultiAir II variable valve control with twin-scroll turbocharging to deliver responsive throttle characteristics and linear power delivery. Designed to meet Euro 6b standards, it balances sporty performance with improved fuel efficiency and emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,742 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve with MultiAir II | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 75.0 mm | |
| Power output | 121–140 kW (165–190 PS) | |
| Torque | 270–330 Nm @ 1,900–4,500 rpm | |
| Fuel system | Direct injection with port injection (twin-injection) | |
| Emissions standard | Euro 6b | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbo (IHI unit) | |
| Timing system | Chain-driven (double-row primary, single-row secondary) | |
| Oil type | SAE 5W-30 C2/C3 (Fiat 9.55535-S2) | |
| Dry weight | 132 kg |
The MultiAir II system enables sharp throttle response and strong mid-range torque, but requires strict adherence to 15,000 km oil change intervals using Fiat 9.55535-S2 specification oil to prevent hydraulic valve actuator degradation. Turbocharger longevity depends on proper warm-up and cool-down procedures; immediate shutdown after high-load operation increases oil coking risk. Direct injection contributes to intake valve coking, necessitating periodic induction cleaning. Post-2018 models benefit from revised oil cooling circuits and updated turbo housings per Technical Bulletin 57/2018. Emissions systems require periodic DTC monitoring to prevent catalyst efficiency faults.
Oil Specs: Requires SAE 5W-30 C2/C3 meeting Fiat 9.55535-S2 specification (Alfa Romeo SIB 57/2018).
Emissions: Euro 6b certification applies to all 939 A5.000 models (2015–2023) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards. 140 kW output requires premium 98 RON fuel (Alfa Romeo TIS Doc. A939PWR).
Alfa Romeo Technical Information System (TIS): Docs A939M2, A939T1, A939FI, SIB 57/2018
VCA Type Approval Database (VCA/EMS/5678)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo 939 A5.000 was used across Alfa Romeo's 940/952/956 platforms with transverse mounting in the Giulietta and longitudinal in the Giulia/Stelvio. This engine received platform-specific tuning—higher boost in the Giulia and revised intake manifolds in the Stelvio—and from 2018, updated turbocharger and cooling configurations per Technical Bulletin 57/2018, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block near the starter motor (Alfa Romeo TIS A939ID1). The 8th VIN digit indicates engine type ('B' for 939 series). Pre-2018 models have a silver valve cover with a single turbocharger on the right side; post-2018 units retain the same layout but feature revised oil cooler lines. Critical differentiation from 2.0L JTS: The 939 A5.000 uses a twin-scroll turbo and MultiAir II valve system, whereas JTS engines are naturally aspirated. Service parts require model-year verification—turbochargers and oil coolers before 2018 are incompatible with later revisions per Technical Bulletin 57/2018.
The 939 A5.000's primary reliability risk is turbocharger bearing wear on early builds, with elevated incidence in short-trip urban use. Internal FCA quality reports from 2019 noted increased turbo failures in pre-2018 models with irregular warm-up/cool-down cycles, while UK DVSA records show a moderate rate of emissions-related faults linked to EGR and catalyst efficiency. Frequent stop-start driving and poor oil maintenance amplify stress, making oil quality and driving habit adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2015–2020) and UK DVSA failure statistics (2018–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO 939A5000.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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