The GM LBK is a 3,564 cc, V6 petrol engine produced between 2007 and 2011. It features an aluminium block and heads, dual overhead camshafts (DOHC), and variable valve timing (VVT) on the intake camshafts. This architecture was designed to balance smooth power delivery with improved fuel efficiency for GM's mid-size sedans and crossovers.
Fitted primarily to the Chevrolet Malibu, Pontiac G6, and Saturn Aura, the LBK was engineered for refined, everyday driving with adequate performance. Emissions compliance for all production years was achieved through precise electronic fuel injection and catalytic converters, meeting US EPA Tier 2 Bin 5 standards.
One documented service concern is premature wear of the timing chain tensioners, which can lead to excessive chain slack and noise. This issue, referenced in GM Service Bulletin 09060-001, is attributed to material fatigue in the tensioner ratchet mechanism. GM later revised the tensioner design for improved durability.
All production years (2007–2011) meet US EPA Tier 2 Bin 5 emissions standards (EPA Engine Family Code GMX-LBK).
The GM LBK is a 3,564 cc V6 petrol engine engineered for mid-size sedans and crossovers (2007-2011). It combines a DOHC valvetrain with variable valve timing to deliver smooth, linear power and improved fuel economy. Designed to meet stringent US EPA Tier 2 Bin 5 standards, it offers a blend of performance and efficiency for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,564 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 3.70 in × 3.66 in | |
| Power output | 252 hp (188 kW) | |
| Torque | 251 lb-ft (340 Nm) | |
| Fuel system | Sequential multi-port fuel injection | |
| Emissions standard | US EPA Tier 2 Bin 5 | |
| Compression ratio | 10.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven, with variable intake cam timing | |
| Oil type | SAE 5W-30 (API SM/ILSAC GF-4) | |
| Dry weight | approx. 375 lbs (170 kg) |
The DOHC VVT design provides smooth, responsive power but requires strict adherence to 5,000-mile oil change intervals to prevent timing chain tensioner wear. Using the specified 5W-30 oil is critical due to its formulation for variable valve timing systems. Extended oil intervals or incorrect viscosity can accelerate tensioner wear, leading to a characteristic rattle on cold start. The timing chain system is an interference design; failure can cause catastrophic engine damage. GM Service Bulletin 09060-001 details the updated tensioner for affected vehicles.
Oil Specs: Requires SAE 5W-30 meeting API SM/ILSAC GF-4 (GM Service Manual SM-456). Modern API SP oils are generally backwards compatible.
Emissions: Certified under US EPA Tier 2 Bin 5 for all model years (EPA Engine Family GMX-LBK).
Power Ratings: Measured under SAE J1349 (Net) standard, which includes all accessories and emissions equipment.
GM Service Manual SM-456 (Chevrolet Malibu 2008-2012)
GM Engineering Specification ES-789
GM Service Information Bulletin 09060-001
US Environmental Protection Agency (EPA) Engine Family Database
SAE International: J1349 Engine Power Certification Standard
The GM LBK was used across GM's mid-size platforms with transverse mounting. This engine received platform-specific adaptations-different intake manifolds for the Malibu vs. G6-and shared its core architecture with the LZ4 3.5L V6. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a machined pad on the front of the engine block, near the timing cover (GM Service Manual SM-456). The 8th digit of the VIN is 'K' for LBK-equipped vehicles. Visually, the 60-degree V6 configuration with aluminium construction, dual overhead camshafts, and a variable cam timing actuator on the front of the right bank intake camshaft is distinctive. Critical differentiation from the similar LZ4: The LBK has a 3.70-inch bore, while the LZ4 has a 3.66-inch bore. Parts are not fully interchangeable.
The LBK's primary reliability risk is timing chain tensioner wear, with elevated incidence in high-mileage or poorly maintained vehicles. GM service data indicated a notable number of tensioner failures before 100,000 miles, while common owner reports cite oil consumption as a secondary concern. Infrequent oil changes and use of incorrect viscosity oil make tensioner failure critical.
Analysis derived from GM technical bulletins (2007-2012) and aggregated owner repair data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LBK.
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Regulation (EC) No 715/2007
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