The Vauxhall A28NET is a 2,792 cc, V6 turbocharged petrol engine produced between 2017 and 2022. It features direct fuel injection, twin — scroll turbocharging, and dual overhead camshafts (DOHC) with variable valve timing. In standard form it delivered 233 kW (320 PS) with 480 Nm of torque, engineered for high performance and refined grand touring.
Fitted exclusively to the Insignia B OPC/VXR and its Buick Regal GS counterpart in select markets, the A28NET was Vauxhall’…
Production years 2017–2018 meet Euro 6b standards; 2019–2022 models comply with Euro 6d TEMP depending on market (VCA UK Type Approval #VCA/EMS/7742).
The Vauxhall A28NET is a 2,792 cc V6 twin-turbo petrol engine engineered for performance sedans and estates (2017–2022). It combines Bosch high-pressure direct injection with twin-scroll turbochargers to deliver linear power delivery and strong mid-range torque. Designed to meet Euro 6b and Euro 6d TEMP emissions standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,792 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24‑valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 86.0 mm × 80.1 mm | |
Power output | 233 kW (320 PS) | |
Torque | 480 Nm @ 1,900–5,000 rpm | |
Fuel system | Bosch HDP6 high-pressure direct injection (up to 200 bar) | |
Emissions standard | Euro 6b (2017–2018); Euro 6d TEMP (2019–2022) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Twin twin-scroll turbochargers (Honeywell) | |
Timing system | Chain (front‑mounted) | |
Oil type | GM Dexos1 Gen 2 (SAE 5W‑40) | |
Dry weight | 198 kg |
The Vauxhall A28NET was used exclusively in the Insignia B OPC/VXR platform with longitudinal mounting and no external licensing. This engine received performance-specific calibrations—including revised boost control logic and enhanced cooling—and from 2019 the Euro 6d TEMP-compliant variants featured updated GPF control strategies and camshaft profiles, creating minor software and hardware interchange limits. All adaptations are documented in OEM technical bulletins.
The A28NET's primary reliability risk is high-pressure fuel pump drive lobe wear on the camshaft in early builds, with elevated incidence in track or aggressive driving. Vauxhall internal quality data from 2020 indicated a measurable rate of camshaft/HPFP replacements before 60,000 km in pre-2019 units, while UK DVSA MOT records show GPF-related backpressure faults increasing after 80,000 km in vehicles with predominantly urban use. Sustained high-load operation without proper warm-up or cooldown accelerates wear, making oil quality and driving pattern critical.
Analysis derived from Vauxhall technical bulletins (2017–2022) and UK DVSA failure statistics (2019–2023). 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 A28NET offers exceptional performance and refinement, but early models (2017–2018) had HPFP drive lobe wear concerns under aggressive use. Post-2019 revisions improved camshaft durability. With proper maintenance—especially using GM Dexos1 Gen 2 oil and avoiding excessive cold starts—these engines can reliably exceed 150,000 km.
Top issues include HPFP cam lobe wear (early builds), GPF regeneration faults from urban driving, turbo wastegate sticking, and intercooler hose detachment. These are documented in Vauxhall service bulletins PI1087 and TIS updates.
The A28NET powered only the Insignia B OPC/VXR (2017–2022) in 3.0 Turbo V6 320 PS form. It was Vauxhall’s flagship performance engine, longitudinally mounted in the Insignia platform and not shared with other brands.
Yes. Stage 1 ECU remaps typically yield +30–50 kW safely, as the twin-turbo setup and forged internals handle moderate increases. However, aggressive tuning without upgraded fuel system and intercooler risks premature HPFP or turbo failure, especially on pre-2019 engines.
Moderate for its performance class. In an Insignia VXR, expect ~10.2 L/100km (28 mpg UK) combined. Real-world mixed driving typically returns 24–30 mpg UK (9.4–11.8 L/100km), depending on driving style and conditions.
Yes. The A28NET is an interference design. Timing chain failure—though rare—can cause piston-to-valve contact and catastrophic damage. The front-mounted chain is robust with proper oil maintenance.
GM Dexos1 Gen 2-approved 5W‑40 synthetic oil is mandatory. This high-shear-stability formulation protects the HPFP drive, turbo bearings, and timing components. Change intervals should not exceed 15,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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EUR-Lex
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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GOV.UK: Vehicle Approval
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