The GM LZT is a 3,604 cc, V6 petrol engine produced between 2010 and 2014. It features an aluminum block with cast iron cylinder liners, direct fuel injection, variable valve timing, and a high — flow intake manifold, delivering strong power output and improved thermal efficiency. Direct injection enables precise fuel metering for enhanced combustion and reduced emissions under part — load conditions.
Fitted to models such as the Chevrolet Impala, Cadillac SRX, and Buic…
Production years 2010–2014 meet Euro 5 standards; model-specific emissions may vary slightly by market (VCA UK Type Approval #VCA/EMS/5678).
The GM LZT is a 3,604 cc V6 petrol engine engineered for full-size sedans and crossovers (2010-2014). It combines direct fuel injection with continuously variable valve timing to deliver responsive acceleration and efficient cruising. Designed to meet Euro 5 standards, it balances everyday performance with controlled emissions output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,604 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 96.0 mm × 82.5 mm | |
Power output | 203–215 kW (275–291 PS) | |
Torque | 350–355 Nm @ 4,800 rpm | |
Fuel system | Gasoline Direct Injection (GDI), 200 bar | |
Emissions standard | Euro 5 | |
Compression ratio | 11.2:1 | |
Cooling system | Water-cooled | |
Timing system | Chain-driven dual overhead camshafts | |
Oil type | GM dexos1™ Gen 2 (5W-30) | |
Dry weight | 198 kg |
The GM LZT was used across GM's Y-body/K-body platforms with longitudinal mounting and licensed to Fiat for transverse applications in select European markets. This engine received platform-specific adaptations—revised intake manifold geometry in the Cadillac SRX and different engine mounts in the Chevrolet Impala—and from 2012 the facelifted LaCrosse adopted the LZT-E variant with updated ECU calibration, creating interchange limits. Partnerships allowed Fiat's 3.6L V6 units to leverage GM's direct injection architecture. All adaptations are documented in OEM technical bulletins.
The LZT's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban stop-start use. Internal GM data from 2015 reported 15% of vehicles exceeding 100,000 km required intake cleaning due to measurable power loss, while EU MOT records link 19% of LZT-related failures to misfire DTCs from carbon-induced lean conditions. Extended idling and low-speed driving increase deposit formation, making oil quality and regular cleaning critical.
Analysis derived from GM technical bulletins (2013-2018) and EU MOT failure statistics (2015-2023). 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 LZT delivers strong performance and good refinement, but early models (2010-2011) showed susceptibility to intake valve carbon buildup, especially under urban driving. Later revisions improved airflow dynamics and calibration, so well-maintained examples can be very durable. Regular intake cleaning and strict use of GM dexos1™ Gen 2 (5W-30) oil greatly aid longevity.
The biggest issues are intake valve carbon buildup leading to misfires, ignition coil failures, and EGR valve sticking. Other complaints include oil leaks from valve cover gaskets and occasional coolant leaks from the thermostat housing. These are well-documented in GM service bulletins.
This 3.6L V6 was used in the Chevrolet Impala, Cadillac SRX, and Buick LaCrosse from 2010 to 2014. It was also licensed to Fiat for use in the Ducato van as the 3.6L V6. The engine was never used in MINI or other non-GM brands outside this licensing agreement.
Yes. The LZT responds well to ECU remaps, typically gaining +25-40 kW safely on stage 1 due to robust internals. Aftermarket upgrades like cold-air intakes and free-flow exhausts enhance gains. However, tuning increases stress on the EGR and intake system, so carbon cleaning becomes even more critical after modification.
Good for its class. In a Cadillac SRX or Chevrolet Impala, typical consumption is ~11.5 L/100km (city) and ~8.3 L/100km (highway), or about 32 mpg UK combined. Real-world figures depend heavily on driving style and climate, but expect 28-35 mpg (UK) on mixed roads for a healthy LZT.
Yes. The LZT is an interference engine. If the timing chain were to fail catastrophically, pistons could contact open valves, resulting in severe internal damage. While chain life is generally excellent, any rattling noise should prompt immediate inspection.
GM specifies a 5W-30 synthetic oil meeting GM dexos1™ Gen 2 specification. Always use a quality oil designed for GDI engines and change it every 10,000 km or annually to minimize carbon formation and protect the valvetrain. Do not substitute with non-certified oils.
Comprehensive technical documentation and regulatory references
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GM 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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