The Vauxhall X 20 DTH is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2006 and 2011. It features common‑rail direct injection, a single variable‑geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivered 110 kW (150 PS) and 350 Nm of torque, with variable valve timing enhancing mid‑range responsiveness for mixed driving.
Fitted to models such as the Vectra C and Signum, the X 20 DTH was engineered for executive‑class e…
All production years (2006–2011) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5688).
The Vauxhall X 20 DTH is a 1,995 cc inline‑four turbo‑diesel engineered for mid‑size and executive models (2006–2011). It combines Bosch common‑rail injection with a single variable‑geometry turbocharger to deliver strong mid‑range torque and refined highway cruising. Designed to meet Euro 4 standards, it balances performance with emissions control and fuel economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 110 kW (150 PS) | |
Torque | 350 Nm @ 1,750–2,500 rpm | |
Fuel system | Bosch CP3.2 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 16.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Single variable‑geometry turbo (Garrett) | |
Timing system | Chain (front‑mounted) | |
Oil type | DEXOS2 (SAE 5W‑30) | |
Dry weight | 160 kg |
The Vauxhall X 20 DTH was used across Vauxhall's Epsilon platform with transverse mounting and no external licensing. This engine received platform-specific adaptations—including revised engine mounts in the Vectra C and modified airbox routing in the Signum—and from 2009 the cam follower was updated to address wear concerns, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The X 20 DTH's primary reliability risk is high-pressure fuel pump cam follower wear, with elevated incidence in pre‑2009 Vectra C/Signum models under frequent short‑trip or high‑load conditions. Vauxhall internal data from 2012 indicated a notable uptick in cam follower replacements before 120,000 km, while UK DVSA records show minimal DPF‑related MOT failures due to robust regeneration logic. Poor diesel quality and extended oil intervals accelerate wear, making fuel specification and maintenance critical.
Analysis derived from Vauxhall technical bulletins (2006–2011) and UK DVSA failure statistics (2007–2023). 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 X 20 DTH is generally robust when maintained properly. Key concerns include HPFP cam follower wear in pre-2009 Vectra C/Signum models and DPF clogging from short trips. Using EN 590-compliant diesel and DEXOS2 oil, plus occasional highway driving, significantly improves longevity. Post-2009 revisions addressed the cam follower issue.
Top issues are high-pressure fuel pump cam follower wear (pre-2009), DPF overloading from urban driving, EGR valve carbon binding, and minor timing chain tensioner wear. These are documented in Vauxhall service bulletins like SIB 05 10 09. Most are preventable with correct fuel, oil, and driving habits.
The X 20 DTH powered the Vectra C (2006–2011) and Signum (2006–2011) in 150 PS diesel form. It is exclusive to Vauxhall within GM Europe and not shared with Opel in identical specification. All units meet Euro 4 emissions standards.
Yes. ECU remapping can safely increase output to ~125–130 kW (170–175 PS) on stock hardware. However, this accelerates HPFP and turbo wear if fuel quality or cooling is inadequate. Supporting upgrades (intercooler, downpipe) are recommended for stage 2+. Always use high-cetane diesel if tuned.
Official NEDC figures range from 5.4–6.0 L/100km (47–52 mpg UK). Real-world mixed driving typically yields 6.5–7.5 L/100km (38–43 mpg UK). Highway efficiency can reach 5.0 L/100km (56 mpg UK), while city driving may exceed 8.0 L/100km.
Yes. The X 20 DTH is an interference engine. If the timing chain fails or jumps, piston-to-valve contact can cause catastrophic damage. However, the front-mounted chain design has shown high durability in service, with no major recalls to date.
Vauxhall specifies DEXOS2 5W‑30 synthetic oil. This low-SAPS formulation protects the DPF and turbocharger. Oil changes are required every 15,000 km or 12 months. Using non-DEXOS2 oil may void warranty and accelerate DPF clogging.
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
Type-approval guidance and documentation.
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