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 performance with an emphasis on low-RPM torque and refinement. Emissions compliance was achieved through its advanced combustion system and three-way catalytic converter, meeting U.S. Tier 2 Bin 5 and Euro 4 standards for its production period.
One documented engineering focus is managing potential intake manifold gasket failure due to material degradation, addressed in GM Service Bulletin #05-06-02-008A. This bulletin outlines revised gasket material specifications and updated torque procedures for the intake manifold to prevent vacuum, oil, and coolant leaks.
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 OHV design offers mechanical simplicity and strong low-end torque ideal for daily commuting but requires strict adherence to 8,000 km or 6-month oil changes using dexos1™ oil to protect the timing chain. The engine's composite intake manifold is susceptible to gasket failure; revised gaskets per GM SIB #05-06-02-008A are recommended for preventative maintenance. Using Top Tier detergent gasoline is recommended to maintain injector and combustion chamber cleanliness.
Oil Specs: Requires GM dexos1™ specification (GM Service Manual SI-8543). This is a mandatory requirement, not a recommendation.
Emissions: Certified to U.S. Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-05-001). Applies to all model years 2005–2009.
Power Ratings: Measured under SAE J1349 standards. Peak output requires 87 AKI (RON 91) or higher fuel (GM Owner's Manual).
GM Technical Information System (TIS): Docs SI-8543, #05-V6-001, #05-06-02-008A
GM Electronic Parts Catalog (EPC): Doc. ENG-7567
U.S. Environmental Protection Agency (EPA) Certificate Database (A-05-001)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code 'LX9' stamped on a machined pad on the front of the engine block, near the timing cover (GM TIS Doc. ENG-ID-004). The 8th digit of the VIN is '9' for vehicles equipped with this engine. Visually, it can be identified by its cast-iron block, aluminum heads, and the 'V6 3.5L' badge on the engine cover. Critical differentiation from the higher-output LZ4: The LX9 produces 200 PS vs. the LZ4's 222 PS, and has a different camshaft profile. Service parts like camshafts and intake manifolds are not interchangeable with the LZ4 without significant modification (GM SIB #05-06-02-008A).
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.
Find answers to most commonly asked questions about GM LX9.
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