The GM LKZ is a 3,564 cc, 60‑degree V6 petrol engine produced between 2016 and 2020. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and direct fuel injection. In standard form it delivered 237 kW (318 PS), with peak torque of 383 Nm, providing strong, responsive performance for full-size applications.
Fitted to models such as the Chevrolet Impala and Buick LaCrosse, the LKZ was engineered for a balance of power, refinement, and efficiency in premium sedans. Emissions compliance was achieved through precise direct injection and advanced three-way catalytic converters, meeting stringent Euro 6 standards across its production run.
One documented concern is potential failure of the high-pressure fuel pump (HPFP), which can lead to drivability issues and no-start conditions. This issue, highlighted in GM Service Bulletin 18‑06‑01‑002, is often linked to internal wear or contamination. GM recommends inspection and replacement if symptoms arise, using only the latest revised pump assembly.
Production years 2016–2020 meet Euro 6 standards (VCA UK Type Approval #VCA/EMS/5681).
The GM LKZ is a 3,564 cc 60-degree V6 petrol engine engineered for full-size premium sedans (2016-2020). It combines DOHC with direct injection and variable valve timing to deliver strong, responsive power and improved fuel efficiency. Designed to meet Euro 6 standards, it represents a refined evolution of GM's high-feature V6 architecture.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,564 cc | |
| Fuel type | Petrol | |
| Configuration | 60° V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 99.0 mm × 76.0 mm | |
| Power output | 237 kW (318 PS) @ 6,800 rpm | |
| Torque | 383 Nm @ 5,200 rpm | |
| Fuel system | SIDI (Spark Ignition Direct Injection) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 11.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | GM Dexos1 Gen 2 (SAE 5W-30) | |
| Dry weight | 160 kg |
The high-compression, direct-injection design delivers strong, linear power but requires strict adherence to 10,000 km oil change intervals using GM Dexos1 Gen 2 to protect the VVT system and timing chain. The engine is sensitive to fuel quality; use of Top Tier gasoline is recommended to minimize intake valve carbon buildup. The high-pressure fuel pump is a known service item; any drivability issues should prompt immediate diagnosis per GM SIB 18-06-01-002. The ECU is calibrated for 95 RON fuel for optimal performance.
Oil Specs: Requires GM Dexos1 Gen 2 (5W-30) specification (GM SIB 18-06-01-002).
Emissions: Euro 6 certification applies to all 2016–2020 models (VCA Type Approval #VCA/EMS/5681).
Power Ratings: Measured under SAE J1349 standards. Requires 95 RON fuel for rated output (GM Service Manual SI-D1600A).
GM Technical Service Information: Docs SI-D1600A, 18-06-01-002
VCA Type Approval Database (VCA/EMS/5681)
SAE International: J1349 Engine Power Certification Standards
The GM LKZ was used across GM's Epsilon II platform with transverse mounting. This engine received platform-specific adaptations-unique engine mounts for the Buick LaCrosse and specific intake manifolds for the Chevrolet Impala-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the timing cover (GM Service Manual SI-D1600A). The 8th VIN digit for LKZ-equipped vehicles is typically 'Z'. The engine can be visually identified by its direct injection fuel rails running along the top of the intake manifold and the “3.6L V6” badge on the plastic engine cover. Critical differentiation from the LCV engine: LKZ has a higher compression ratio (11.5:1 vs 11.3:1) and revised engine management calibration. ECU software is specific to model and year.
The LKZ's primary reliability consideration is potential failure of the high-pressure fuel pump (HPFP), a documented service item in GM bulletins. While not universal, GM internal data indicated a notable service rate for this component, making prompt diagnosis and replacement with revised parts critical for maintaining drivability and preventing no-start conditions.
Analysis derived from GM technical bulletins (2016-2020) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LKZ.
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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