The GM LGX is a 3,564 cc, V6 petrol engine produced from 2016 to present. It features an aluminium block and heads, dual overhead camshafts (DOHC), and continuously variable valve timing (CVVT) on both intake and exhaust camshafts. This advanced architecture delivers a broad, flat torque curve and class — leading refinement for GM's premium SUVs and crossovers.
Fitted primarily to the Cadillac XT5, XT6, and Chevrolet Traverse, the LGX was engineered for smooth, effortle…
All production years (2016–Present) meet US EPA Tier 3 Bin 70 emissions standards (EPA Engine Family Code GMX-LGX).
The GM LGX is a 3,564 cc V6 petrol engine engineered for premium SUVs and crossovers (2016-Present). It combines a DOHC valvetrain with direct injection and dual CVVT to deliver smooth, responsive power and excellent fuel efficiency. Designed to meet stringent US EPA Tier 3 Bin 70 standards, it offers a compelling blend of luxury, performance, and environmental compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,564 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.0 mm × 85.8 mm | |
Power output | 310 hp (231 kW) | |
Torque | 271 lb-ft (367 Nm) | |
Fuel system | Gasoline direct injection (GDI) | |
Emissions standard | US EPA Tier 3 Bin 70 | |
Compression ratio | 11.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven, with continuously variable intake and exhaust cam timing | |
Oil type | DEXOS1 Gen 2 (SAE 5W-30) | |
Dry weight | approx. 375 lbs (170 kg) |
The GM LGX was used across GM's premium SUV platforms with transverse mounting. This engine received platform-specific adaptations-different engine mounts and accessory brackets for the XT5 vs. Traverse-and shares its core architecture with the LGZ 3.6L V6. All adaptations are documented in OEM technical bulletins.
The LGX's primary reliability risk is carbon buildup on intake valves, with elevated incidence in high-mileage or short-trip driven vehicles. GM service data indicated a notable number of cleaning procedures after 60,000 miles, while common owner reports cite timing chain noise as a secondary concern. Infrequent oil changes and use of non-DEXOS oil make chain wear critical.
Analysis derived from GM technical bulletins (2016-Present) and aggregated owner repair data (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 GM LGX is a robust and refined engine with proper maintenance. The main concerns are intake valve carbon buildup and potential timing chain wear. Regular oil changes with DEXOS1 Gen 2 oil and periodic intake cleaning are essential. With these precautions, the engine can easily reach 200,000+ miles.
The most frequent issues are carbon buildup on intake valves, timing chain tensioner wear (causing noise), high-pressure fuel pump failure, and oil leaks from gaskets. These are well-documented in GM service literature and can be managed with proactive maintenance.
The 3.6L LGX V6 is used in several GM premium vehicles, including the Cadillac XT5 (2017-Present), Cadillac XT6 (2020-Present), and Chevrolet Traverse (2018-Present, RS and Premier trims). It is the standard or optional engine for these models.
Minor gains are possible with a performance air intake and ECU tune, yielding perhaps 10-15 additional horsepower. Significant power increases are not practical due to the engine's naturally aspirated design. Its strength is in smooth, reliable power delivery for luxury SUVs.
Fuel economy is competitive for a 3.6L V6 in a large SUV. In a 2020 Cadillac XT5 AWD, expect around 18 mpg (US) in the city and 25 mpg (US) on the highway. Actual figures vary with driving style, vehicle weight, and conditions.
Yes. The GM LGX is an interference engine. If the timing chain were to fail or jump significantly, the pistons and valves will collide, causing severe internal engine damage.
GM mandates the use of DEXOS1 Generation 2 specification oil, typically SAE 5W-30. Using non-DEXOS oil can void the warranty and lead to premature engine wear, particularly of the timing chain system. Change intervals should not exceed 7,500 miles.
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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