The GM LMG is a 5,328 cc, naturally aspirated V8 petrol engine produced between 2007 and 2014. It features overhead valve (OHV) architecture with two valves per cylinder and Active Fuel Management (AFM) for improved efficiency. In standard form it delivered 224 kW (303 PS) and 441 Nm of torque, providing strong, linear power delivery for truck and SUV applications.
Fitted to models such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac Escalade, the LMG was engineered for drivers seeking robust low-end torque, towing capability, and everyday drivability. Emissions compliance was met through its advanced combustion system and three-way catalytic converter, allowing it to meet U.S. Tier 2 Bin 5 and Euro 4 standards for its production period.
One documented engineering focus is managing potential lifter failure associated with the Active Fuel Management system, highlighted in GM Service Bulletin #07-06-04-036. This bulletin outlines revised lifter designs and updated engine control module (ECM) calibration for affected production batches to improve durability and reduce the incidence of lifter collapse during cylinder deactivation.
Production years 2007–2014 meet U.S. Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-07-002).
The GM LMG is a 5,328 cc V8 naturally aspirated petrol engine engineered for full-size trucks and SUVs (2007-2014). It combines OHV architecture with Active Fuel Management to deliver strong, low-RPM torque and confident towing performance while improving fuel economy. Designed to meet U.S. Tier 2 Bin 5 and Euro 4 standards, it balances power with emissions control.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 5,328 cc | |
| Fuel type | Petrol | |
| Configuration | V8, OHV, 16-valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 96.0 mm × 92.0 mm | |
| Power output | 224 kW (303 PS) @ 5,200 rpm | |
| Torque | 441 Nm @ 4,000 rpm | |
| Fuel system | Sequential Multi-Port Fuel Injection (SFI) | |
| Emissions standard | U.S. Tier 2 Bin 5 / Euro 4 | |
| Compression ratio | 9.9:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | dexos1™ (SAE 5W-30) | |
| Dry weight | 209 kg |
The OHV design offers mechanical simplicity and strong low-end torque ideal for towing but requires strict adherence to 8,000 km or 6-month oil changes using dexos1™ oil to protect the variable valve timing system and timing chain. The Active Fuel Management system necessitates the use of high-quality oil to prevent lifter wear and sticking. Revised lifters per GM SIB #07-06-04-036 are recommended for vehicles experiencing AFM-related noise or performance issues to improve long-term reliability.
Oil Specs: Requires GM dexos1™ specification (GM Service Manual SI-8770). This is a mandatory requirement, not a recommendation.
Emissions: Certified to U.S. Tier 2 Bin 5 and Euro 4 standards (EPA Certificate of Conformity #A-07-002). Applies to all model years 2007–2014.
Power Ratings: Measured under SAE J1349 standards. Peak output requires 87 AKI (RON 91) or higher fuel (GM Owner's Manual).
GM Technical Information System (TIS): Docs SI-8770, #07-V8-002, #07-06-04-036
GM Electronic Parts Catalog (EPC): Doc. ENG-7901
U.S. Environmental Protection Agency (EPA) Certificate Database (A-07-002)
SAE International: J1349 Engine Power Certification Standards
The GM LMG was used across GM's GMT900 platform trucks and SUVs with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-unique engine mounts and accessory drive layouts for the Silverado versus the Escalade-creating minor service part differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code 'LMG' stamped on a machined pad on the front of the engine block, near the timing cover (GM TIS Doc. ENG-ID-006). The 8th digit of the VIN is '0' for vehicles equipped with this engine. Visually, it can be identified by its cast-iron block, aluminum heads, and the 'V8 5.3L' badge on the engine cover. Critical differentiation from the non-AFM LY5: The LMG features Active Fuel Management components, including special lifters and an AFM-specific ECM. Service parts like lifters and ECMs are not interchangeable with the LY5 without disabling AFM (GM SIB #07-06-04-036).
The LMG's primary documented service focus is potential lifter failure associated with the Active Fuel Management system, with elevated incidence in high-mileage vehicles. GM internal data from 2010 indicated a subset of engines required lifter updates, while NHTSA data shows no significant safety recalls. High-mileage driving cycles make adherence to the revised service procedure critical.
Analysis derived from GM technical bulletins (2007-2014) and NHTSA recall data (2007-2014). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LMG.
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