The GM L52 is a 3,510 cc, V6 naturally aspirated petrol engine produced between 2004 and 2009. It features sequential multi — port fuel injection, a single overhead camshaft (SOHC) per bank, and variable valve timing (VVT) on the intake camshafts. This engine delivered 152 kW (207 PS) and 305 Nm of torque, with its 60 — degree V — angle design providing inherent smoothness for comfortable daily driving.
Fitted to models such as the Chevrolet Colorado, GMC Canyon, and Hummer H3…
Production years 2004–2009 meet US Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-2345-2004).
The GM L52 is a 3,510 cc V6 naturally aspirated petrol engineered for mid-size trucks and SUVs (2004-2009). It combines multi-port fuel injection with intake variable valve timing to deliver smooth, linear power and robust low-end torque. Designed to meet US Tier 2 Bin 5 and Euro 4 standards, it prioritizes durability and everyday utility.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,510 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | V6, 60°, SOHC, 12-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 95.5 mm × 82.0 mm | |
Power output | 152 kW (207 PS) @ 5,200 rpm | |
Torque | 305 Nm @ 2,800 rpm | |
Fuel system | Sequential Multi-Port Fuel Injection | |
Emissions standard | US Tier 2 Bin 5 / Euro 4 | |
Compression ratio | 10.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 178 kg |
The GM L52 was developed for GM's global mid-size truck and SUV platforms with longitudinal mounting. This engine received platform-specific adaptations-unique accessory drive layouts for the Colorado/Canyon versus the H3-and no major facelift revisions have been documented to date. All adaptations are documented in OEM technical bulletins.
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The L52's primary documented concern is intake manifold gasket failure, with elevated incidence in vehicles with high mileage. GM internal data correlates gasket lifespan with thermal cycling, while owner reports frequently cite coolant leaks and vacuum leaks. Adherence to coolant change intervals is critical for long-term reliability.
Analysis derived from GM technical bulletins (2004-2009) and NHTSA consumer complaint data (2004-2009). Repair procedures should follow manufacturer guidelines.
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The L52 is generally a robust and durable engine. Its primary long-term concern is the intake manifold gasket, which is a known failure point. With timely replacement of the gasket and adherence to maintenance schedules, the L52 can easily exceed 250,000 km without major issues.
The most frequent issues are intake manifold gasket failure, variable valve timing actuator faults, timing chain tensioner wear, and worn engine mounts. These are documented in GM service bulletins and NHTSA owner complaints.
The L52 engine is found in the Chevrolet Colorado (2004–2009), GMC Canyon (2004–2009), and Hummer H3 (2006–2009). It is not used in any other GM models or licensed to other manufacturers.
Yes, the L52 responds well to basic modifications. A performance tune can add 10-15 kW and 20-30 Nm by optimizing ignition and fueling. More significant power gains require hardware upgrades like a performance camshaft or cylinder head work, which are less common due to the SOHC design.
Official figures are around 12.5 L/100km combined for 4x4 models. Real-world driving typically yields 13.5-16.5 L/100km (17-21 mpg US) depending on driving style, payload, and whether 4WD is engaged. Highway cruising can achieve ~10.5 L/100km.
No. The GM L52 is a non-interference engine. If the timing chain fails or jumps, the pistons will not contact the valves, preventing catastrophic internal engine damage. This is a significant design advantage for longevity.
GM recommends a good quality 5W-30 motor oil meeting API SM or equivalent specifications. While GM Goodwrench is specified, any major brand meeting the viscosity and API standard is suitable. Change intervals are 7,500 km or 6 months.
Comprehensive technical documentation and regulatory references
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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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