The Daewoo D18T is a 1,796 cc, inline — four turbo — diesel engine produced between 2006 and 2011. It features common — rail direct fuel injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC) with 16 valves, delivering strong low — end torque and improved fuel efficiency. In standard tune it produces 88 kW (120 PS) and 230 Nm of torque, making it suitable for compact and mid — size sedans requiring responsive diesel performance.
Fitted to models…
Daewoo
Production years 2006–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/6789).
The Daewoo D18T is a 1,796 cc inline-four turbo-diesel engine engineered for mid-size sedans (2006–2011). It combines common-rail direct injection with a variable geometry turbocharger to deliver strong low-RPM torque and efficient cruising. Designed to meet Euro 4 emissions standards, it balances everyday drivability with fuel economy and emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,796 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (VGT) | |
Bore × stroke | 80.5 mm × 88.3 mm | |
Power output | 88 kW (120 PS) @ 4,000 rpm | |
Torque | 230 Nm @ 1,800–2,500 rpm | |
Fuel system | Bosch CRS 2.0 common-rail (up to 1,600 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 17.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Variable geometry turbo (VGT, Honeywell) | |
Timing system | Rubber timing belt (interval: 90,000 km) | |
Oil type | SAE 5W-30, API CI-4/SL | |
Dry weight | 148 kg |
The Daewoo D18T was used across Daewoo's Tosca and Chevrolet's Lacetti Premiere platforms with transverse mounting and shared GM Europe architecture. This engine received platform-specific adaptations-reinforced mounts in the Tosca and revised ECU tuning in the Lacetti-and from 2009 the facelifted Lacetti adopted the D18T with updated emissions calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The D18T's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in regions with poor diesel quality. Internal GM Korea reports from 2008 indicated a notable number of pre-2009 engines requiring HPFP replacement before 100,000 km, while UK DVSA records show fuel system faults as a leading cause of MOT rejection for imported models. Extended idling and delayed maintenance increase injector and pump stress, making adherence to service intervals and fuel quality critical.
Analysis derived from GM Korea technical bulletins (2006-2011) and UK DVSA failure statistics (2013-2023). 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 D18T is generally reliable when maintained properly. Early models (2006–2008) had HPFP issues, but post-2009 revisions improved durability. Regular timing belt service at 90,000 km, use of EN 590 diesel, and correct oil (5W-30 API CI-4/SL) are essential for long-term reliability.
The most common issues are high-pressure fuel pump failure, EGR valve coking, DPF regeneration problems, and timing belt wear. These are documented in GM Korea service bulletins and are typically preventable with scheduled maintenance and proper fuel quality.
The D18T was used in the Daewoo Tosca (2006–2011) and the Chevrolet Lacetti Premiere (2007–2011). It was also offered in select Middle Eastern and Asian markets under the Chevrolet brand. All models are front-wheel drive with transverse engine mounting.
Yes. The D18T responds well to ECU remapping, with stage 1 tunes typically adding 20–30 kW. The Bosch EDC17 ECU is widely supported. However, significant increases require upgraded turbo and fuel system components, which are not commonly available. Stock internals can handle moderate tuning if cooling and oil systems are maintained.
In combined driving, the D18T achieves approximately 5.8 L/100km (49 mpg UK). City driving may see 7.0 L/100km, while highway efficiency can reach 5.0 L/100km. Real-world consumption depends on driving style, maintenance condition, and fuel quality.
Yes. The D18T is an interference engine. If the timing belt fails or jumps, the pistons can contact the valves, causing severe internal damage. Adhering to the 90,000 km replacement interval is critical to avoid costly repairs.
The D18T requires SAE 5W-30 viscosity oil meeting API CI-4/SL standards. Use of GM 6277M or equivalent is recommended. Oil should be changed every 15,000 km or annually to maintain turbo, injector, and timing system health.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with DAEWOO or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
DAEWOO 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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialDAEWOO documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.