The Vauxhall M9T 672 is a 2,298 cc, inline‑four twin — turbo diesel engine produced between 2016 and 2021. It features a DOHC 16‑valve layout, common‑rail direct injection, and a sequential twin — turbo system (low — pressure and high — pressure VGTs), delivering 140 kW (190 PS) and 400 Nm of torque. Its robust architecture provides strong low — end response and sustained high — load capability ideal for larger vehicles and towing.
Fitted primarily to the Insignia B (2017–202…
All production years (2016–2021) meet Euro 6d TEMP or Euro 6d standards depending on registration date (VCA UK Type Approval #VCA/EMS/9120).
The Vauxhall M9T 672 is a 2,298 cc inline‑four twin-turbo diesel engineered for D‑segment and LCV platforms (2016–2021). It combines high-pressure common‑rail injection with sequential variable‑geometry turbochargers to deliver exceptional low‑rpm torque and sustained power for towing or highway cruising. Designed to meet Euro 6d TEMP (and later Euro 6d) standards, it integrates AdBlue-based SCR for NOx control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,298 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 85.0 mm × 101.3 mm | |
Power output | 140 kW (190 PS) | |
Torque | 400 Nm @ 1,500–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6d TEMP / Euro 6d (by registration date) | |
Compression ratio | 15.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Sequential twin VGT (Garrett LP + BorgWarner HP) | |
Timing system | Chain (front‑mounted) | |
Oil type | DEXOS2 (SAE 5W‑30) | |
Dry weight | 172 kg |
The Vauxhall M9T 672 was used across Vauxhall's D‑segment and LCV platforms with transverse mounting and sourced from Renault under the GM–Renault supply agreement. This engine received platform-specific adaptations—reinforced engine mounts in the Insignia B and modified exhaust routing in the Vivaro B—and from 2019 adopted updated turbo actuators per service bulletin, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The M9T 672's primary reliability risk is high-pressure turbocharger actuator failure, with elevated incidence in fleet, towing, or motorway-heavy vehicles. Vauxhall internal field data from 2020 indicated a measurable uptick in turbo-related DTCs before 100,000 km in commercial applications, while UK DVSA MOT records show low SCR/DPF failures due to robust AdBlue dosing logic. Extended high-load operation without cooldown increases actuator thermal fatigue, making driving pattern and oil quality critical.
Analysis derived from Vauxhall technical bulletins (2016–2021) and UK DVSA failure statistics (2018–2023). Repair procedures should follow manufacturer guidelines.
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The M9T 672 offers exceptional torque and towing capability, but early units (2016–2019) had HP turbo actuator reliability concerns under sustained high-load use. Post-2019 revisions improved actuator durability. With DEXOS2 oil, quality diesel, and proper cooldown after towing, well-maintained examples can be dependable beyond 150,000 km.
Top issues include high-pressure turbo actuator failure, AdBlue system faults, EGR cooler leaks, and DPF ash accumulation. These are documented in Vauxhall service bulletins, particularly SIB 09 18 05 for turbo concerns. Proper maintenance significantly reduces occurrence.
This 2.3L twin-turbo diesel was used in the Insignia B (2017–2021) and Vivaro B (2016–2021) as the '2.3 BiTurbo CDTi 190' variant. It is a Renault-sourced M9T engine supplied under the GM–Renault partnership. All meet Euro 6d TEMP or Euro 6d emissions depending on registration date.
Limited tuning potential exists. Stage 1 ECU remaps may yield +15–20 kW, but the twin-turbo system and SCR aftertreatment are near design limits. Aggressive tuning risks turbo actuator failure and AdBlue system errors. Vauxhall does not endorse modifications, and tuning may void emissions compliance under UK law.
Good for a high-torque diesel. In an Insignia 2.3 BiTurbo CDTi 190, typical consumption is ~6.2 L/100km (city) and ~4.8 L/100km (highway), or about 47 mpg UK combined. Real-world mixed driving usually achieves 40–48 mpg (UK), depending on load and route. AdBlue consumption averages 1.5–2.0 L/1,000 km.
Yes. Like all modern DOHC engines, the M9T 672 is an interference design. If the timing chain fails, piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain has shown good durability with proper oil maintenance.
Vauxhall specifies DEXOS2-approved 5W-30 synthetic oil. This low-SAPS formulation protects the DPF, SCR catalyst, and turbochargers. Change intervals should not exceed 15,000 km or 12 months—sooner if used for frequent towing. Using non-DEXOS2 oil risks aftertreatment damage and voids warranty claims.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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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