The GM LY7 is a 3,510 cc, 60‑degree V6 petrol engine produced between 2004 and 2011. It features dual overhead camshafts (DOHC), variable valve timing (VVT), and sequential fuel injection. In standard form it delivered 177 kW (237 PS), with peak torque of 325 Nm, providing smooth, linear power for mid — size applications.
Fitted to models such as the Chevrolet Malibu, Pontiac G6, and Saab 9‑3, the LY7 was engineered for refinement and adequate power in global markets. Emissi…
Production years 2004–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5683).
The GM LY7 is a 3,510 cc 60-degree V6 petrol engine engineered for mid-size sedans and coupes (2004-2011). It combines DOHC with variable valve timing to deliver smooth, linear power and responsive mid-range torque. Designed to meet Euro 4 standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,510 cc | |
Fuel type | Petrol | |
Configuration | 60° V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 99.0 mm × 76.0 mm | |
Power output | 177 kW (237 PS) @ 6,500 rpm | |
Torque | 325 Nm @ 3,200 rpm | |
Fuel system | Sequential multi-port fuel injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | GM Dexos1 (SAE 5W-30) | |
Dry weight | 165 kg |
The GM LY7 was used across GM's Epsilon platform with transverse mounting and licensed to Saab for longitudinal applications. This engine received platform-specific adaptations-unique engine mounts for the Saab 9-3 and specific intake manifolds for the Chevrolet Malibu-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The LY7'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-2007 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 (2004-2011) and UK DVSA failure statistics (2015-2023). 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 LY7 is generally robust with smooth power delivery, but pre-2007 models are prone to cam actuator failures. Post-2007 revisions improved reliability. Long-term health heavily depends on strict oil change intervals using GM Dexos1 oil. With proper maintenance, these engines can exceed 200,000 km reliably.
The most frequent issues are failing camshaft position actuators (triggering check engine lights), faulty IMRC systems causing performance loss, and in some early engines, excessive oil consumption due to piston ring wear. Water pump leaks are also a common age-related failure.
The LY7 3.5L V6 was used in the Chevrolet Malibu (2004-2007), Pontiac G6 (2005-2007), and Saab 9-3 (2005-2011, naturally aspirated variant). It was the standard V6 for these mid-size applications during this period.
Yes, modest gains are possible. Simple ECU tunes can yield +10-15 kW by optimizing ignition and fuel maps. More significant power requires hardware like a performance intake, exhaust, and potentially camshafts. The stock internals are reliable for mild tuning, but aggressive modifications are not recommended.
Fuel economy is typical for a 3.5L V6 of its era. In a 2006 Malibu, expect around 12.5 L/100km in the city and 8.0 L/100km on the highway, averaging approximately 10.0 L/100km (28 mpg UK) combined. Actual figures vary significantly with driving style and conditions.
Yes. The LY7 is an interference engine. If the timing chain fails or jumps, the pistons can collide with the open valves, causing catastrophic internal engine damage. While the chain is generally durable, maintaining proper oil level and quality is crucial for its longevity.
GM mandates the use of Dexos1-approved 5W-30 synthetic blend or full synthetic oil. Using the correct specification is vital for protecting the VVT system and preventing sludge buildup that leads to actuator failure. Change intervals should not exceed 10,000 km or 12 months.
Comprehensive technical documentation and regulatory references
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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.
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