The Vauxhall G9T 750 is a 2,298 cc, inline‑four turbo‑diesel engine produced between 2013 and 2018. It features a DOHC 16‑valve layout, common‑rail direct injection, and a single variable geometry turbocharger (VGT), delivering 100 kW (136 PS) and 320 Nm of torque. Its robust architecture provides strong low‑end pull and refined operation across urban and motorway conditions.
Fitted primarily to the Insignia B (2017–2018) and Zafira Tourer C (2013–2017), the G9T 750 w…
All production years (2013–2018) meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/8520).
The Vauxhall G9T 750 is a 2,298 cc inline‑four turbo‑diesel engineered for mid‑size models (2013–2018). It combines common‑rail direct injection with a single variable‑geometry turbocharger to deliver strong low‑rpm torque and efficient motorway cruising. Designed to meet Euro 6 standards, it balances performance with low emissions and fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,298 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 85.0 mm × 101.3 mm | |
Power output | 100 kW (136 PS) | |
Torque | 320 Nm @ 1,500–2,500 rpm | |
Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
Emissions standard | Euro 6 | |
Compression ratio | 15.8:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | DEXOS2 (SAE 5W‑30) | |
Dry weight | 158 kg |
The Vauxhall G9T 750 was used across Vauxhall's D‑segment platforms with transverse mounting and sourced from Renault under the GM–Renault supply agreement. This engine received platform-specific adaptations—revised engine mounts in the Insignia B and modified exhaust routing in the Zafira Tourer C—and from 2016 adopted updated HPFP couplings per service bulletin, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The G9T 750's primary reliability risk is high-pressure fuel pump (HPFP) drive coupling failure, with elevated incidence in high-mileage or motorway-heavy vehicles. Vauxhall internal field data from 2017 indicated a measurable uptick in HPFP replacements before 120,000 km in fleet or long-distance applications, while UK DVSA MOT records show low DPF-related failures due to robust regeneration logic. Extended high-load operation without proper warm-up increases coupling stress, making oil quality and driving pattern critical.
Analysis derived from Vauxhall technical bulletins (2013–2018) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
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The G9T 750 offers strong torque and good refinement, but early units (2013–2016) had HPFP coupling reliability concerns under high-load use. Post-2016 revisions improved durability. With DEXOS2 oil, quality diesel, and avoidance of excessive towing without warm-up, well-maintained examples can be dependable beyond 150,000 km.
Top issues include HPFP drive coupling wear, interrupted DPF regeneration from short-trip driving, EGR valve carbon seizure, and turbo actuator calibration drift. These are documented in Vauxhall service bulletins, particularly SIB 04 16 11 for HPFP concerns. Proper maintenance significantly reduces occurrence.
This 2.3L turbo-diesel was used in the Insignia B (2017–2018) and Zafira Tourer C (2013–2017) as the '2.3 CDTi 136' variant. It is a Renault-sourced G9T engine supplied under the GM–Renault partnership. All meet Euro 6 emissions from launch.
Limited tuning potential exists. Stage 1 ECU remaps may yield +10–15 kW, but the stock HPFP and turbo are near design limits. Aggressive tuning risks accelerated HPFP coupling wear and DPF overload. Vauxhall does not endorse modifications, and tuning may void emissions compliance under UK law.
Good for a 2.3L diesel. In an Insignia 2.3 CDTi 136, typical consumption is ~5.2 L/100km (city) and ~4.0 L/100km (highway), or about 58 mpg UK combined. Real-world mixed driving usually achieves 50–58 mpg (UK), depending on route and load. DPF regeneration cycles may temporarily increase consumption.
Yes. Like all modern DOHC engines, the G9T 750 is an interference design. If the timing chain fails (rare but possible), 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 and turbo. Change intervals should not exceed 15,000 km or 12 months—sooner if used for frequent short trips. Using non-DEXOS2 oil risks aftertreatment damage and voids warranty claims.
Comprehensive technical documentation and regulatory references
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VAUXHALL Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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