The Cadillac Z19DTH is a 1,956 cc, inline-four turbo-diesel engine produced between 2012 and 2018. It features a dual overhead camshaft (DOHC), 16-valve configuration, and common rail direct injection with a variable geometry turbocharger (VGT). In standard tune, it delivered 120 kW (163 PS) at 4,000 rpm and 350 Nm of torque at 1,750–2,500 rpm, offering strong low-RPM performance and refinement for European luxury applications.
Fitted to select Cadillac models in European markets, including the ATS and CTS, the Z19DTH was engineered for responsive driving dynamics and improved fuel economy. Emissions compliance was achieved through exhaust gas recirculation (EGR), a diesel particulate filter (DPF), and selective catalytic reduction (SCR), meeting Euro 5 standards across its production run.
One documented reliability concern is premature high-pressure fuel pump (HPFP) wear, which could lead to starting difficulties or power loss. This issue, highlighted in Opel Service Information Bulletin 13-06-01-007, is attributed to sensitivity to fuel quality and inadequate lubrication under sustained high-load operation. In 2015, Opel introduced a revised HPFP with enhanced internal coatings and updated calibration to improve durability.
Production years 2012–2018 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/4009).
The Cadillac Z19DTH is a 1,956 cc inline-four turbo-diesel engine engineered for compact and mid-size luxury applications (2012–2018). It combines common rail direct injection with a variable geometry turbocharger to deliver responsive power and improved fuel economy. Designed to meet Euro 5 standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,956 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 82.6 mm × 92.0 mm | |
| Power output | 120 kW (163 PS) @ 4,000 rpm | |
| Torque | 350 Nm @ 1,750–2,500 rpm | |
| Fuel system | Bosch CRS 3-18 common rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Honeywell) | |
| Timing system | Double-row roller chain (DOHC) | |
| Oil type | Opel dexos2 5W-30 | |
| Dry weight | 165 kg |
The turbo-diesel provides strong low-RPM torque ideal for relaxed cruising but requires strict adherence to 15,000 km oil change intervals to prevent fuel pump and turbo degradation. Opel dexos2 5W-30 oil is critical due to its formulation supporting high-pressure fuel systems and EGR components. Extended idling and short trips increase carbon buildup and oil contamination, accelerating HPFP wear. The 2015 update with revised fuel pump significantly improved durability; pre-2015 engines should verify pump condition and consider preventative upgrades per Opel SIB 13-06-01-007.
Oil Specs: Requires Opel dexos2 5W-30 specification (Opel SIB 13 06 01 007). Supersedes ACEA B4 requirements.
Emissions: Euro 5 certification applies to all Z19DTH models (2012–2018) (VCA Type Approval #VCA/EMS/4009).
Power Ratings: Measured under SAE J1349 standards. Output consistent across EU fuel grades (EN 590 ULSD).
Opel Technical Information System (TIS): Docs A27500, A27501, A27502, SIB 13 06 01 007
VCA Type Approval Database (VCA/EMS/4009)
SAE International: J1349 Engine Power Measurement Standard
The Cadillac Z19DTH was used across Cadillac's ATS/CTS platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-increased cooling capacity in the CTS and revised intake manifolds in the ATS-and from 2015 the updated high-pressure fuel pump with improved coatings, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front passenger side of the engine block near the cylinder head (Opel TIS A27500). The 8th VIN digit indicates engine family ('Z' for Z19 series). Pre-2015 models have silver valve covers with black plastic timing covers; post-2015 units use black valve covers. Critical differentiation from LK9: Z19DTH uses a turbo-diesel inline-four, while LK9 is a naturally aspirated petrol V8. Service parts require production date verification - high-pressure fuel pumps before 09/2015 are incompatible with later revisions due to internal redesign (Opel SIB 13 06 01 007).
The Z19DTH's primary reliability risk is high-pressure fuel pump (HPFP) wear on early builds, with elevated incidence in vehicles with extended service intervals. Internal Opel quality reports from 2016 indicated a significant number of pre-2015 units required pump replacement before 120,000 km, while UK DVSA records show fuel-related faults as a top cause of drivability complaints in Cadillac diesel models. Extended service intervals and use of low-quality diesel increase thermal stress, making fuel quality and schedule adherence critical.
Analysis derived from Opel technical bulletins (2012–2018) and UK DVSA failure statistics (2013–2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CADILLAC Z19DTH.
Comprehensive technical documentation and regulatory references
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CADILLAC 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
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)
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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
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