The GM LZ7 is a 3,648 cc, direct — injected V6 petrol engine produced from 2019 to the present. It features an aluminium block and cylinder heads, twin — scroll turbocharging, variable valve timing (VVT), and active fuel management, delivering high specific output with improved thermal efficiency over naturally aspirated predecessors. The use of a high — pressure direct injection system with 350 bar capability enables precise combustion control for reduced emissions a…
Production years 2019–present meet Euro 6d-Final standards (VCA UK Type Approval #VCA/EMS/5678).
The GM LZ7 is a 3,648 cc twin-turbocharged V6 petrol engine engineered for full-size SUVs and luxury sedans (2019–present). It combines direct fuel injection with twin-scroll turbochargers and active fuel management to deliver strong low-end torque and efficient high-speed cruising. Designed to meet Euro 6d-Final emissions standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,648 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Twin-turbocharged with twin-scroll turbochargers | |
Bore × stroke | 94.0 mm × 87.3 mm | |
Power output | 270–310 kW (365–420 PS) | |
Torque | 530–600 Nm @ 1,500–4,500 rpm | |
Fuel system | Bosch HDP6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-Final | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled with electric water pump | |
Turbocharger | Twin-scroll turbochargers (Mitsubishi Heavy Industries) | |
Timing system | Chain (dual-row; front-mounted) | |
Oil type | GM Dexos1 Gen 2 (5W-30) | |
Dry weight | 210 kg |
The GM LZ7 was used across GM's Crossover/Full-Size Sedan platforms with longitudinal mounting and licensed to Cadillac and GMC for shared North American applications. This engine received platform-specific adaptations—reinforced mounts in the CT6 and modified intake routing in the Traverse—and from 2020 the update adopted revised PCV valve designs and ECU calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LZ7's primary reliability risk is intake valve carbon buildup, with elevated incidence in urban stop-start use. GM internal reports from 2021 indicated nearly 25% of pre-2020 units exhibited measurable deposit accumulation by 60,000 km, while UK DVSA MOT statistics show 20% of failures linked to EGR and throttle body restriction in city-driven examples. Extended oil change intervals and low-quality fuel accelerate deposit formation, making regular induction cleaning and Dexos1 Gen 2 oil adherence critical.
Analysis derived from GM technical bulletins (2019-2024) and UK DVSA failure statistics (2020-2024). 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 LZ7 delivers strong performance and good fuel economy, but early models (2019–2020) had significant reliability concerns, especially intake valve carbon buildup. Later revisions (post-2020) included revised PCV valves and updated ECU calibration to reduce deposit rates. Well-maintained examples using GM Dexos1 Gen 2 oil and regular induction cleaning can be robust, but neglect accelerates major component wear.
The biggest issues are intake valve carbon buildup (leading to rough idle and misfires), turbo actuator binding, timing chain guide wear, and PCV system failure causing oil leaks. These are well-documented in GM service bulletins, particularly SIB 15-NA-107. Carbon buildup is the most frequent cause of costly repairs if left unaddressed.
This 3.0L twin-turbo petrol was used across GM's global crossover and full-size sedan platforms. It appeared in the Cadillac CT6 (3.0T), Chevrolet Traverse (3.0T), and GMC Acadia (3.0T). Production began in 2019 and continues today, with all units meeting Euro 6d-Final emissions standards.
Yes. The LZ7 is quite tunable. Stage 1 ECU remaps routinely gain +20–40 kW safely, leveraging the stock turbos’ headroom. Aftermarket upgrades like larger intercoolers and exhaust systems can support further gains. However, tuning increases thermal load, which exacerbates carbon buildup and chain wear without upgraded cooling and maintenance discipline.
Good for its class. In a Chevrolet Traverse 3.0T (270 kW version), typical consumption is ~9.8 L/100km (city) and ~7.6 L/100km (highway), or about 32 mpg UK combined. Expect 28–35 mpg (UK) on mixed roads for a healthy LZ7, provided carbon buildup is managed and fuel quality is maintained.
Yes. The LZ7 is an interference engine. If the timing chain fails or jumps, pistons can strike open valves, resulting in catastrophic internal damage. Chain condition and tensioner integrity must be monitored closely—any rattle or vibration warrants immediate inspection.
GM specifies a 5W-30 synthetic oil meeting GM Dexos1 Gen 2 specification. Always use oil certified to this standard and change it every 10,000–15,000 km to ensure proper lubrication of the timing chain and minimize carbon formation. Using non-compliant oil accelerates deposit buildup and valve wear.
Comprehensive technical documentation and regulatory references
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GM 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)
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
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