The Vauxhall A20DT is a 1,956 cc, inline‑four turbo‑diesel engine produced between 2011 and 2018. Developed jointly with General Motors as part of the Family 0 diesel series, it features a high — pressure common‑rail fuel system, a fixed — geometry turbocharger, and dual overhead camshafts (DOHC). In standard form it delivers 88–103 kW (120–140 PS) with peak torque of 320–350 Nm, offering strong low‑rpm pull for everyday drivability.
Fitted to models such as the Insignia…
All production years (2011–2018) meet Euro 5b standards; no Euro 6 variants were produced .
The Vauxhall A20DT is a 1,956 cc inline‑four turbo‑diesel engineered for mid-size sedans and MPVs (2011–2018). It combines high-pressure common‑rail injection with a fixed-geometry turbocharger to deliver robust low-end torque and strong towing performance. Designed to meet Euro 5b emissions standards, it relies on EGR and DPF systems without SCR/AdBlue.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,956 cc | |
Fuel type | Diesel | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 84.0 mm | |
Power output | 88–103 kW (120–140 PS) | |
Torque | 320–350 Nm @ 1,750–2,000 rpm | |
Fuel system | Bosch CP3.4 common‑rail (up to 1,600 bar) | |
Emissions standard | Euro 5b | |
Compression ratio | 16.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Fixed-geometry turbo (BorgWarner) | |
Timing system | Chain (front‑mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 162 kg |
The Vauxhall A20DT was used across Vauxhall's Insignia A, Zafira Tourer, and Cascada platforms with transverse mounting and shared with Opel and Holden under GM global architecture. This engine received platform-specific calibrations—reinforced engine mounts in the Zafira and acoustic covers in the Insignia—and from mid-2014 the camshaft material update created minor interchange limits for fuel pump compatibility. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 A20DT offers strong torque and towing capability, but early models (2011–2014) are prone to camshaft lobe wear driving the fuel pump. Post-2014 revisions improved durability. Longevity depends heavily on using DEXOS2 5W-30 oil, EN 590 diesel, and adhering to 15,000 km service intervals.
Top issues include camshaft lobe wear (affecting fuel pump drive), DPF regeneration faults, EGR valve sticking, and oil leaks from cam/sump covers. These are documented in Vauxhall TSBs and DVSA MOT data. Regular oil changes and correct fuel/oil greatly reduce risk.
The A20DT powered the Insignia A (2011–2017), Zafira Tourer (2011–2018), and Cascada (2013–2018) in 2.0 CDTi 120/140 variants. It is mechanically identical to the GM Family 0 diesel used in Opel Insignia and Holden Commodore (export) from the same era.
Aftermarket ECU tuning is common on the A-20-DT platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Good for its class. In an Insignia 2.0 CDTi 140, expect ~5.8 L/100km (city) and ~4.2 L/100km (highway), or ~54 mpg UK combined. Real-world mixed driving typically returns 48–52 mpg (UK) with conservative use.
Yes. The A20DT 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 is generally robust with proper oil maintenance.
Vauxhall specifies DEXOS2 5W-30 synthetic oil. This is mandatory for turbo-diesel protection and camshaft lobe lubrication. Change every 15,000 km or annually—whichever comes first—to prevent soot buildup and wear.
Comprehensive technical documentation and regulatory references
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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.
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