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 prem…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The LKZ is a powerful and refined engine. Its main long-term considerations are potential HPFP failure and managing intake valve carbon buildup. With regular maintenance, including strict oil changes using Dexos1 Gen 2 and periodic intake cleaning, these engines can reliably exceed 200,000 km. AFM lifter issues, while not universal, are a known concern on some units.
The most frequent issues are potential failure of the high-pressure fuel pump, carbon buildup on intake valves, wear of the timing chain tensioner, and in some cases, failure of the Active Fuel Management lifters. These are well-documented in GM service information and are the primary service items for this engine.
The LKZ 3.6L V6 was used in the Chevrolet Impala (2016-2020) and Buick LaCrosse (2017-2019). It was the standard or optional V6 for these full-size premium sedans during this period, offering a balance of power and efficiency.
Yes, the LKZ responds very well to tuning. Simple ECU flashes can unlock 20-30 kW of additional power by optimizing timing and fuel maps. More aggressive modifications like a performance intake and exhaust can yield further gains. The engine's internals are strong and can handle moderate power increases reliably.
Fuel economy is respectable for a 3.6L V6. In a 2018 Impala, expect around 13.5 L/100km in the city and 9.0 L/100km on the highway, averaging approximately 11.0 L/100km (26 mpg UK) combined. Actual figures vary significantly with driving style, vehicle weight, and conditions.
Yes. The LKZ is an interference engine. If the timing chain fails or jumps significantly, the pistons can collide with the open valves, causing catastrophic internal engine damage. The timing chain is generally durable, but maintaining proper oil level and quality is crucial.
GM mandates the use of Dexos1 Gen 2-approved 5W-30 full synthetic oil. This specific formulation is critical for protecting the engine's high-compression design, variable valve timing, and Active Fuel Management system. Change intervals should not exceed 10,000 km or 12 months, whichever comes first.
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 GM 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.
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.
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 officialGM 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.