The GM LKG is a 3,564 cc, naturally aspirated V6 petrol engine produced between 2011 and 2017. It features a 60-degree bank angle, dual overhead camshafts (DOHC), and variable valve timing on both intake and exhaust camshafts. This architecture delivers smooth, linear power and strong mid-range torque, making it suitable for premium sedans and crossovers.
Fitted primarily to the Cadillac CTS, XTS, and ATS, the LKG was engineered for refined, quiet operation and responsive performance. Emissions compliance for its production period was achieved through precise engine management and catalytic conversion, meeting Euro 5 standards.
One documented engineering update addressed potential camshaft position sensor failure, detailed in GM Service Bulletin #13467B. This was linked to electrical signal degradation under high-temperature conditions. The update, implemented in early 2013, revised the sensor design and connector sealing to improve reliability.
Production years 2011–2017 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/5683).
The GM LKG is a 3,564 cc V6 petrol engine engineered for premium mid-size and large sedans (2011-2017). It combines DOHC with dual variable valve timing to deliver smooth, linear power and strong mid-range torque. Designed to meet Euro 5 standards, it balances performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,564 cc | |
| Fuel type | Petrol | |
| Configuration | V6, 60°, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 94.0 mm × 85.6 mm | |
| Power output | 224–239 kW (305–325 PS) | |
| Torque | 355–374 Nm @ 3,200–5,200 rpm | |
| Fuel system | Sequential multi-port fuel injection | |
| Emissions standard | Euro 5 | |
| 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 | 168 kg |
The high-compression V6 provides smooth, refined power delivery but requires adherence to 15,000 km oil change intervals using GM Dexos1 Gen 2 (5W-30) to maintain engine health and VVT system longevity. The chain-driven timing system is robust. Dual variable valve timing solenoids can become sluggish with poor oil quality, leading to performance codes. Early production engines (pre-early 2013) should have the updated camshaft position sensor installed if experiencing intermittent faults, per GM SIB 13467B.
Oil Specs: Requires GM Dexos1 Gen 2 (5W-30) specification (GM SIB 13467B). Critical for VVT solenoid and sensor longevity.
Emissions: Euro 5 certification applies to all 2011–2017 LKG models (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under SAE J1349 standards. Output is consistent across applications (GM TIS Doc. A12393).
GM Technical Information System (TIS): Docs A12390, A12391, A12392, A12393, SIB 13467B
VCA Type Approval Database (VCA/EMS/5683)
SAE International: J1349 Engine Power Certification Standards
The GM LKG was used across GM's premium platforms with longitudinal mounting. This engine received minor ECU calibrations for different model applications. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing cover (GM TIS A12396). The 8th VIN digit typically corresponds to the engine type for GM models of this era. Visually, the LKG is identifiable by its aluminum block and heads, and the intake manifold design. Critical differentiation from the LFX engine: The LKG has a higher 11.5:1 compression ratio and slightly different cam profiles for optimized performance in the ATS and XTS. Service parts, particularly for sensors and gaskets, may differ between LKG and LFX engines.
The LKG's primary documented concern is potential camshaft position sensor failure in early builds, addressed by a GM service bulletin. GM internal data indicated a subset of pre-early 2013 engines required the sensor update. Adherence to correct oil specification and change intervals is critical to prevent secondary issues like VVT solenoid failure.
Analysis derived from GM technical bulletins (2012-2017) and UK DVSA failure statistics (2018-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LKG.
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.
