The GM LX9 is a 3,510 cc, naturally aspirated V6 petrol engine produced between 2005 and 2009. It features overhead valve (OHV) architecture with two valves per cylinder and sequential fuel injection. Peak output is rated at 147 kW (200 PS) and 302 Nm of torque, providing smooth, linear power delivery for mid — size applications.
Fitted primarily to the Chevrolet Equinox, Pontiac Torrent, and Saturn Vue, the LX9 was engineered for drivers seeking dependable, everyday perf…
Production years 2005–2009 meet U.S. Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-05-001).
The GM LX9 is a 3,510 cc V6 naturally aspirated petrol engine engineered for mid-size SUVs (2005-2009). It combines OHV architecture with sequential fuel injection to deliver smooth, low-RPM torque and confident everyday performance. Designed to meet U.S. Tier 2 Bin 5 and Euro 4 standards, it balances power with emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,510 cc | |
Fuel type | Petrol | |
Configuration | V6, OHV, 12-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 99.0 mm × 84.0 mm | |
Power output | 147 kW (200 PS) @ 5,200 rpm | |
Torque | 302 Nm @ 4,000 rpm | |
Fuel system | Sequential Multi-Port Fuel Injection (SFI) | |
Emissions standard | U.S. Tier 2 Bin 5 / Euro 4 | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | dexos1™ (SAE 5W-30) | |
Dry weight | 169 kg |
The GM LX9 was used across GM's Theta platform SUVs with transverse mounting and no external licensing. This engine received platform-specific adaptations-unique engine mounts and accessory drive layouts for the Equinox versus the Vue-creating minor service part differences. All adaptations are documented in OEM technical bulletins.
The LX9's primary documented service focus is potential intake manifold gasket failure, with elevated incidence in high-mileage vehicles. GM internal data from 2007 indicated a subset of engines required gasket updates, while NHTSA data shows no significant safety recalls. High-mileage driving cycles make adherence to the revised service procedure critical.
Analysis derived from GM technical bulletins (2005-2009) and NHTSA recall data (2005-2009). 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 LX9 is generally robust, with its simple OHV design reducing complexity. The primary concern is intake manifold gasket failure, which is addressed by a factory service bulletin. With regular maintenance using dexos1™ oil and attention to the intake manifold, it should provide dependable long-term service.
The most common documented issues are intake manifold gasket failure, exhaust manifold bolt breakage, knock sensor failure, and valve cover gasket leaks. These are addressed in GM service bulletins and are generally manageable with proper maintenance.
The LX9 engine was found in the Chevrolet Equinox, Pontiac Torrent, and Saturn Vue from the 2005 to 2009 model years. It was not used in any other GM vehicles or beyond the 2009 model year.
Yes, the LX9 can be tuned. An ECU remap can yield modest gains of 10-15 kW by optimizing ignition and fuel maps. Bolt-on modifications like a performance exhaust and cold air intake can add further gains. Significant power increases require internal modifications.
Fuel economy is typical for a 3.5L V6 of its era. In a Chevrolet Equinox FWD, expect around 13.8 L/100km (city) and 9.8 L/100km (highway), or approximately 21 mpg (US) combined. Real-world figures vary based on driving style and vehicle weight.
No. The GM LX9 is a non-interference engine. If the timing chain were to fail, the pistons would not contact the open valves, preventing catastrophic internal damage. The engine would simply stop running, requiring a timing chain replacement.
GM mandates the use of dexos1™ full synthetic oil, typically in 5W-30 viscosity. Using the correct specification is critical for the health of the timing chain and to minimize wear. This is non-negotiable for warranty compliance and engine longevity.
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.