The GM LZ5 is a 3,604 cc, V6 naturally — aspirated petrol engine produced between 2007 and 2010. It features an aluminium block with cast iron cylinder liners, direct fuel injection, and variable valve timing delivering up to 210 kW (282 PS) and 349 Nm of torque. The Active Fuel Management system enables cylinder deactivation for improved fuel efficiency during light — load cruising.
Fitted to models such as the Chevrolet Impala, Buick Lucerne, and Cadillac DTS, the LZ5 was e…
Production years 2007–2008 meet Euro 4 standards; 2009–2010 models may have Euro 5 compliance depending on market .
The GM LZ5 is a 3,604 cc V6 naturally-aspirated petrol engine engineered for full-size sedans (2007-2010). It combines direct fuel injection with variable valve timing and Active Fuel Management to deliver refined performance and improved fuel economy. Designed to meet Euro 4 (and some market-specific Euro 5) standards, it balances smoothness with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,604 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally-aspirated | |
Bore × stroke | 97.0 mm × 81.0 mm | |
Power output | 195–210 kW (263–282 PS) | |
Torque | 349 Nm @ 3,600 rpm | |
Fuel system | Bosch HDP3 direct injection (up to 160 bar) | |
Emissions standard | Euro 4 (pre-2009); Euro 5 depending on market | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled | |
Timing system | Chain (front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 188 kg |
The GM LZ5 was used across GM's Impala, Lucerne, and DTS platforms with longitudinal mounting and no licensed external use. This engine received platform-specific adaptations-reinforced crankshaft main bearings in the DTS and revised intake manifold geometry in the Impala-and from 2009 the facelifted Lucerne adopted an updated camshaft design, creating interchange limits. 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 LZ5 delivers smooth power and good refinement, but early models (2007-2008) had significant reliability concerns, especially camshaft lobe wear. Later revisions (post-2009) improved camshaft surface hardness, so well-maintained examples can be robust. Strict adherence to 10,000 km oil changes with DEXOS™ 5W-30 greatly aids longevity.
The biggest issues are camshaft lobe wear (leading to misfires and power loss), Active Fuel Management system failure, intake manifold gasket leaks, and water pump seal degradation. These are well-documented in GM service bulletins and owner reports, with camshaft wear being the most prevalent early fault.
The LZ5 V6 was used exclusively in GM's lineup: the Chevrolet Impala (2007-2010), Buick Lucerne (2008-2010), and Cadillac DTS (2007-2010). It was not licensed to other manufacturers. In all models it was marketed as the 3.6L V6.
Aftermarket ECU tuning is common on the LZ5 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 a large V6. In an Impala LTZ, typical consumption is ~11.8 L/100km (city) and ~7.9 L/100km (highway), or about 34 mpg UK combined. The DTS achieves slightly better figures, often around 8.6 L/100km (combined). Expect 30-40 mpg (UK) on mixed roads for a healthy LZ5, heavily dependent on load and driving style.
No. The LZ5 is a non-interference engine. If the timing chain fails, pistons will not collide with open valves, preventing catastrophic engine damage. However, valve train noise and misfires will occur, requiring immediate attention to avoid secondary component wear.
GM specifies DEXOS™ 5W-30 synthetic oil meeting GMW16731 specification. Always use a quality oil designed for modern V6 engines and change it every 10,000 km or annually to ensure proper camshaft lubrication and protect against AFM system degradation.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
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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