The Alfa Romeo AR 06158 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2016 and 2023. It forms part of Alfa Romeo's transition to downsized, high-efficiency gasoline powertrains, featuring direct fuel injection, variable valve timing (Dual VVT), and a single-scroll turbocharger. In standard tune it delivers 110 kW (150 PS), with torque peaking at 240 Nm from 1,750 rpm, providing responsive low-end performance ideal for urban driving.
Fitted to the 952 Giulia and 956 Stelvio in base-trim configurations, the AR 06158 was engineered to offer a balance of fuel efficiency and everyday drivability while maintaining Alfa Romeo's sporty character. Emissions compliance is achieved through a three-way catalytic converter, closed-loop lambda control, and cooled exhaust gas recirculation (EGR), enabling Euro 6c certification across its production run for European markets.
One documented concern is premature wear of the timing chain tensioner, noted in Alfa Romeo Technical Bulletin 48/2019. This issue arises from inadequate oil pressure supply to the tensioner piston during cold starts, leading to chain slack and noise. From 2019 onward, revised tensioner hardware and updated oil pump calibration were implemented to improve reliability.
Production years 2016–2018 meet Euro 6c standards; 2019–2023 models comply with Euro 6d-TEMP (VCA UK Type Approval #VCA/EMS/6158).
The Alfa Romeo AR 06158 is a 1,995 cc inline-four turbocharged petrol engine engineered for compact and mid-size performance models (2016–2023). It combines direct fuel injection with a single-scroll turbocharger to deliver strong low-end torque and linear power delivery. Designed to meet Euro 6 emissions standards, it balances everyday usability with spirited driving dynamics.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (single-scroll) | |
| Bore × stroke | 88.0 mm × 82.0 mm | |
| Power output | 110 kW (150 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 1,750–4,500 rpm | |
| Fuel system | Direct injection (up to 200 bar) | |
| Emissions standard | Euro 6c (2016–2018); Euro 6d-TEMP (2019–2023) | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI single-scroll turbo with vacuum-actuated wastegate | |
| Timing system | Chain-driven (single-row, front-mounted) | |
| Oil type | SAE 5W-40, API SN/CF, ACEA C3 | |
| Dry weight | 136 kg |
The single-scroll turbo provides predictable throttle response and usable mid-range pull, but requires adherence to 15,000 km oil service intervals to protect the timing chain and turbo bearings. Use of ACEA C3 5W-40 oil is essential to maintain particulate filter compatibility and reduce carbon buildup. Extended idling after high-load operation should be avoided to prevent heat soak in the turbocharger. Direct injectors are prone to deposit accumulation; periodic cleaning per Alfa Romeo procedure is recommended. Post-2019 models benefit from updated tensioner design and oil pump calibration, reducing chain-related noise and wear.
Oil Specs: Requires ACEA C3 5W-40 specification (Alfa Romeo SIB 48/2019). Compatible with API SN/CF standards.
Emissions: Euro 6c certification applies to 2016–2018 models (VCA Type Approval #VCA/EMS/6158). Euro 6d-TEMP applies from 2019 onward.
Power Ratings: Measured under ECE R101 standards. Output assumes premium unleaded (RON 98) fuel quality (Alfa Romeo TIS A1995T06).
Alfa Romeo Technical Information System (TIS): Docs A1995T01, A1995T02, A1995T05, SIB 48/2019
VCA Type Approval Database (VCA/EMS/6158)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo AR 06158 was used across Alfa Romeo's 952/956 platforms with longitudinal mounting in both the Giulia and Stelvio, creating shared drivetrain architecture. This engine received platform-specific calibrations-adapted intake manifolds in the 952 and revised cooling layouts in the 956-and from 2019 the facelifted Stelvio adopted a revised ECU map for improved cold-start emissions. 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 A1995T07). The 8th VIN digit indicates engine type ('C' for AR 06158). Pre-2019 models have silver valve covers with black intake manifolds; post-2019 units use black valve covers. Critical differentiation from higher-output versions: AR 06158 uses IHI RHF3 VJ25 turbo with rectangular compressor housing, while 200 HP variants use larger IHI RHF3 VJ27 unit. Service parts require model-year verification - tensioners before 06/2019 are incompatible with later revisions per Alfa Romeo SIB 48/2019.
The AR 06158's primary reliability risk is timing chain tensioner wear, with elevated incidence in cold climates and short-trip driving. Internal Alfa Romeo field reports from 2020 indicated a notable number of pre-2019 units required tensioner replacement before 100,000 km, while UK DVSA records show increased catalytic converter degradation linked to prolonged lean-running conditions. Frequent cold starts and low-speed operation increase stress on the chain system, making oil quality and warm-up cycles critical.
Analysis derived from Alfa Romeo technical bulletins (2016-2023) and UK DVSA failure statistics (2018-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR06158.
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