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’s flagship performance engine, offering strong mid-range thrust and smooth high-rpm delivery. Emissions compliance was achieved through gasoline particulate filtration (GPF), precise lambda control, and cooled exhaust gas recirculation (EGR), meeting Euro 6b and Euro 6d TEMP standards depending on model year.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) drive mechanism, highlighted in Vauxhall Service Bulletin PI1087. This stems from excessive torsional stress on the camshaft lobe driving the pump under sustained high-load conditions. From late 2019, revised camshaft profiles and pump internals were introduced to enhance durability.
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 A28NET delivers exhilarating performance but requires strict adherence to oil change intervals (every 15,000 km or 12 months) to protect the high-pressure fuel pump drive and turbo bearings. GM Dexos1 Gen 2 (5W‑40) oil is essential due to its high thermal stability and shear resistance. Sustained high-load operation without adequate warm-up or cooldown can accelerate HPFP cam lobe wear—addressed in Vauxhall SIB PI1087 with updated components. The gasoline particulate filter (GPF) demands occasional highway driving to enable passive regeneration and prevent backpressure issues.
Oil Specs: Requires GM Dexos1 Gen 2 (5W‑40) specification (Vauxhall SIB PI1087). Meets ACEA C5 with enhanced high-temperature protection.
Emissions: Euro 6b certification applies to 2017–2018 models only (VCA Type Approval #VCA/EMS/7742). Euro 6d TEMP compliance for 2019–2022 models confirmed via VCA database.
Power Ratings: Measured under ISO 1585 standards. Output consistent across all applications (Vauxhall TIS Doc. T28‑1110).
Vauxhall Technical Information System (TIS): Docs T28‑1101, T28‑1105, SIB PI1087
VCA Type Approval Database (VCA/EMS/7742)
ISO 1585: Road vehicles — Engine test code
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.
Locate the engine code stamped on the left cylinder bank near the exhaust manifold (Vauxhall TIS T28‑1101). The 7th VIN digit indicates engine family ('8' for 2.8 Turbo V6 series). Euro 6b units (2017–2018) use Bosch MD1CS003 ECU with silver fuel rail; Euro 6d TEMP models (2019+) feature MD1CS005 ECU and black fuel rail with integrated pressure sensor. Critical differentiation from earlier naturally aspirated V6s: A28NET has twin turbochargers mounted within the V-angle and direct injection. HPFP drive lobe revision introduced in 09/2019—verify camshaft part number against Vauxhall ETK before replacement.
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.
Find answers to most commonly asked questions about VAUXHALL A-28-NET.
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