The GM LGD is a 3,564 cc, naturally aspirated V6 petrol engine produced between 2007 and 2012. It features a 60-degree bank angle, dual overhead camshafts (DOHC), and variable valve timing on the intake camshafts. This architecture delivers smooth, linear power and strong mid-range torque, making it suitable for larger sedans and crossovers.
Fitted primarily to the Cadillac CTS, STS, and SRX, as well as the Saab 9-3 and 9-5 during GM's ownership, the LGD was engineered for refined, quiet operation and responsive performance. Emissions compliance for its production period was achieved through precise engine management and catalytic conversion, meeting Euro 4 standards.
One documented engineering update addressed potential oil consumption in early production units, detailed in GM Service Bulletin #09345B. This was linked to initial piston ring design tolerances. The update, implemented in late 2008, revised ring specifications to improve sealing and reduce consumption.
Production years 2007–2012 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5682).
The GM LGD is a 3,564 cc V6 petrol engine engineered for premium mid-size and large sedans (2007-2012). It combines DOHC with variable valve timing to deliver smooth, linear power and strong mid-range torque. Designed to meet Euro 4 standards, it balances performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,564 cc | |
| Fuel type | Petrol | |
| Configuration | V6, 60°, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 94.0 mm × 85.6 mm | |
| Power output | 190–239 kW (258–325 PS) | |
| Torque | 340–374 Nm @ 3,200–5,200 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 Gen 2 (SAE 5W‑30) | |
| Dry weight | 172 kg |
The V6 configuration provides smooth, refined power delivery but requires adherence to 15,000 km oil change intervals using GM Dexos1 Gen 2 (5W-30) to maintain engine health and address potential oil consumption. The chain-driven timing system is generally robust but benefits from periodic tensioner inspection. Variable valve timing solenoids can become sluggish with poor oil quality, leading to performance codes. Early production engines (pre-late 2008) should have the piston ring update performed if excessive oil consumption is noted, per GM SIB 09345B.
Oil Specs: Requires GM Dexos1 Gen 2 (5W-30) specification (GM SIB 09345B). Critical for piston ring and VVT solenoid longevity.
Emissions: Euro 4 certification applies to all 2007–2012 LGD models (VCA Type Approval #VCA/EMS/5682).
Power Ratings: Measured under SAE J1349 standards. Output varies by application and model year (GM TIS Doc. A12383).
GM Technical Information System (TIS): Docs A12380, A12381, A12382, A12383, SIB 09345B
VCA Type Approval Database (VCA/EMS/5682)
SAE International: J1349 Engine Power Certification Standards
The GM LGD was used across GM's premium platforms with longitudinal mounting. This engine received minor ECU calibrations for different model applications. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing cover (GM TIS A12388). The 8th VIN digit typically corresponds to the engine type for GM models of this era. Visually, the LGD is identifiable by its aluminum block and heads, and the intake manifold design. Critical differentiation from the later LFX engine: The LGD uses a different variable valve timing actuator and has a lower power output. Service parts are not always interchangeable between LGD and LFX engines.
The LGD's primary documented concern is potential oil consumption in early builds, addressed by a GM service bulletin. GM internal data indicated a subset of pre-late 2008 engines required the piston ring update. Adherence to correct oil specification and change intervals is critical to prevent secondary issues like VVT solenoid failure.
Analysis derived from GM technical bulletins (2008-2012) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LGD.
Comprehensive technical documentation and regulatory references
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GM Official Site
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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
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