The GM LB8 is a 3,564 cc, 60‑degree V6 petrol engine produced between 2007 and 2011. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and sequential fuel injection. In standard form it delivered 180 kW (241 PS), with peak torque of 325 Nm, providing smooth power delivery for mid-size applications.
Fitted to models such as the Chevrolet Malibu, Pontiac G6, and Saturn Aura, the LB8 was engineered for a balance of refinement, adequate power, and fuel efficiency for daily commuting. Emissions compliance was achieved through precise fuel metering and three-way catalytic converters, meeting stringent Euro 4 standards across its production run.
One documented concern is premature failure of the camshaft position actuators, which can trigger check engine lights and affect performance. This issue, highlighted in GM Service Bulletin 07‑06‑01‑007B, is often linked to oil flow restrictions or solenoid wear. Revised actuators were introduced for the 2009 model year to address the concern.
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The GM LB8 is a 3,564 cc 60-degree V6 petrol engine engineered for mid-size sedans (2007-2011). It combines DOHC with variable valve timing to deliver smooth, linear power delivery and responsive mid-range torque. Designed to meet Euro 4 standards, it balances performance with regulatory compliance.
| 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 | 180 kW (241 PS) @ 6,300 rpm | |
| Torque | 325 Nm @ 3,200 rpm | |
| Fuel system | Sequential multi-port fuel injection | |
| Emissions standard | Euro 4 | |
| Compression ratio | 10.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | GM Dexos1 (SAE 5W-30) | |
| Dry weight | 168 kg |
The DOHC VVT system provides smooth, linear power but requires strict adherence to 10,000 km oil change intervals using GM Dexos1 to prevent cam actuator failure and timing chain wear. Dexos1 specification is critical due to its specific anti-wear and sludge control properties protecting the VVT solenoids. The engine is sensitive to low oil levels; regular checks are advised. Revised camshaft position actuators are available per GM SIB 07-06-01-007B for pre-2009 models. The ECU is calibrated for 95 RON fuel; lower octane may cause pre-ignition and reduced performance.
Oil Specs: Requires GM Dexos1 (5W-30) specification (GM SIB 07-06-01-007B). Supersedes API SM requirements.
Emissions: Euro 4 certification applies to all 2007–2011 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Requires 95 RON fuel for rated output (GM Service Manual SI-B0700A).
GM Technical Service Information: Docs SI-B0700A, 07-06-01-007B
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The GM LB8 was used across GM's Epsilon platform with transverse mounting. This engine received platform-specific adaptations-unique engine mounts for the Saturn Aura and specific intake manifolds for the Chevrolet Malibu-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the engine block, near the timing cover (GM Service Manual SI-B0700A). The 8th VIN digit for LB8-equipped vehicles is typically '8'. Pre-2009 models use an earlier design camshaft actuator (black solenoid body); post-2009 units have a revised actuator (grey solenoid body). Critical differentiation from the LZ4 3.5L: LB8 has a unique intake manifold casting number and DOHC valve covers. Service parts, particularly for the VVT system, require production date verification - actuators for engines before 01/2009 are incompatible with later units due to solenoid redesign (GM SIB 07-06-01-007B).
The LB8's primary reliability risk is camshaft position actuator failure, with elevated incidence in vehicles with extended oil change intervals. GM internal data indicated a notable failure rate before 100,000 km in pre-2009 builds, while general repair data shows these actuators as a common replacement item. Neglected oil changes and use of non-Dexos1 oil make actuator replacement critical.
Analysis derived from GM technical bulletins (2007-2011) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LB8.
Comprehensive technical documentation and regulatory references
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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