The GM LY2 is a 3,564 cc, 60‑degree V6 petrol engine produced between 2007 and 2011. It features an aluminum block and heads, dual overhead camshafts (DOHC), and variable valve timing (VVT) on the intake cam. This High Feature engine delivered 252–263 hp and 251–253 lb‑ft of torque, balancing smooth, high-RPM power with modern efficiency.
Fitted to models such as the Cadillac CTS and Saab 9-3, the LY2 was engineered for refined, sporty performance with an emphasis on linear power delivery and premium driving dynamics. Emissions compliance was achieved through precise electronic throttle control and catalytic converters, meeting U.S. Tier 2 Bin 5 standards.
One documented concern is premature wear of the timing chain tensioners, which can lead to chain noise and potential misalignment. This issue, highlighted in GM Service Bulletin 07‑06‑01‑007, is often linked to tensioner guide wear or hydraulic pressure loss. GM later revised the tensioner design for improved durability.
All production years (2007–2011) meet U.S. Tier 2 Bin 5 standards (EPA Engine Family Code: 3GAXV03.6LBAK).
The GM LY2 is a 3,564 cc 60-degree V6 petrol engine engineered for premium sedans (2007-2011). It combines DOHC with variable valve timing to deliver smooth, linear power delivery. Designed to meet U.S. Tier 2 Bin 5 standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 3,564 cc | |
| Fuel type | Petrol (Gasoline) | |
| Configuration | 60° V6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 94.0 mm × 85.6 mm | |
| Power output | 252–263 hp (188–196 kW) | |
| Torque | 251–253 lb-ft (340–343 Nm) | |
| Fuel system | Sequential multi-port fuel injection (SFI) | |
| Emissions standard | U.S. Tier 2 Bin 5 | |
| Compression ratio | 10.2:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (with known tensioner issues) | |
| Oil type | SAE 5W-30 API SM/SN | |
| Dry weight | 402 lb (182 kg) |
The DOHC/VVT design provides smooth, high-RPM power but requires vigilance for the known timing chain tensioner weakness. Using the specified SAE 5W-30 oil and adhering to 5,000-mile change intervals is critical to ensure proper lubrication. The high compression ratio performs best with premium (91+ octane) fuel. Spark plug replacement is accessible but requires care to avoid damaging the coil-on-plug units. Vehicles exhibiting a rattle from the timing cover should have the tensioner inspected per GM bulletin 07-06-01-007.
Oil Specs: Requires SAE 5W-30 meeting API SM/SN specification (GM Owner's Manual). Dexos1 Gen 2 is a suitable modern equivalent.
Emissions: Tier 2 Bin 5 certification applies to all 2007-2011 LY2 engines (EPA 3GAXV03.6LBAK).
Power Ratings: Measured under SAE J1349 standards. Output varies by model (e.g., 263 hp in Cadillac CTS) (GM Powertrain Manual PTM-3600-07).
GM Technical Service Bulletins: 07-06-01-007
GM Service Manual SM-3600-01
U.S. Environmental Protection Agency (EPA) Engine Certification Database
SAE International: J1349 Engine Power Certification Standards
The GM LY2 was used across GM's Sigma platform with longitudinal mounting and licensed to Saab. This engine received platform-specific adaptations-different intake manifolds and accessory brackets for the CTS versus the 9-3-and from 2009 the tensioner was revised for improved durability, creating a key service part difference. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front of the engine block, near the timing cover (GM TIS 3600-001). The 8th digit of the VIN is '9' for vehicles equipped with the LY2 engine. Pre-2009 engines have an earlier-design tensioner (P/N 12586541) prone to failure; post-2009 units have a revised tensioner (P/N 12607892). Critical differentiation from the similar LFW 2.8L: The LY2 is a 3.6L (casting number 12611685) while the LFW is a 2.8L (casting number 12611684).
The LY2's primary reliability risk is timing chain tensioner failure, with elevated incidence in high-RPM or poorly maintained vehicles. GM internal data indicated a significant number of warranty claims for tensioner replacement, while owner reports consistently cite a distinctive rattle as the first symptom. Extended oil change intervals and use of incorrect oil viscosity make the updated tensioner and strict maintenance critical.
Analysis derived from GM technical bulletins (2007-2011) and NHTSA complaint data (2007-2015). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LY2.
Comprehensive technical documentation and regulatory references
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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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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