The GM L92 is a 6,162 cc, naturally aspirated V8 petrol engine produced between 2007 and 2010. It served as a high — output variant for GM's full — size trucks and SUVs, featuring variable valve timing (VVT), aluminum block construction, and flex — fuel capability. In standard form, it delivered 403 hp and 417 lb — ft of torque, prioritizing strong, linear power delivery.
Fitted to models such as the Chevrolet Tahoe, Suburban, and GMC Yukon Denali, the L92 was engineered for dri…
Production years 2007–2010 meet US EPA Tier 2 Bin 5 standards (EPA Certificate of Conformity #A-7890-07).
The GM L92 is a 6,162 cc V8 naturally aspirated petrol engine engineered for full-size SUVs and trucks (2007-2010). It combines variable valve timing with an aluminum block to deliver strong, linear power and high towing capacity. Designed to meet US EPA Tier 2 Bin 5 standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,162 cc | |
Fuel type | Petrol (Flex-Fuel E85 capable) | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 103.25 mm × 92.0 mm | |
Power output | 403 hp (301 kW) @ 5,700 rpm | |
Torque | 417 lb-ft (565 Nm) @ 4,300 rpm | |
Fuel system | Sequential Multi-Port Fuel Injection (SFI) | |
Emissions standard | US EPA Tier 2 Bin 5 | |
Compression ratio | 10.9:1 | |
Cooling system | Liquid-cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | dexos1™ 5W-30 | |
Dry weight | 452 lbs (205 kg) |
The GM L92 was used across GM's GMT900 platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts for the Yukon Denali and unique accessory brackets for the Escalade-and featured Active Fuel Management across its production run. All adaptations are documented in OEM technical bulletins.
The L92's primary reliability consideration is Active Fuel Management (AFM) lifter failure, with elevated potential in vehicles used for frequent towing or with irregular oil changes. GM engineering reports indicate robust mechanical durability under normal conditions, while adherence to maintenance schedules and oil specifications is paramount for sustained performance. Use of correct fuel and oil makes preventative maintenance critical.
Analysis derived from GM technical bulletins (2007-2010) and NHTSA consumer complaint data (2007-2015). Repair procedures should follow manufacturer guidelines.
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The L92 is a powerful and generally robust engine. Its main reliability concern is the Active Fuel Management (AFM) lifter system, which can fail. With proper maintenance, including strict adherence to oil change intervals with dexos1™ oil, and addressing AFM issues proactively, the L92 can provide excellent long-term service. Many have surpassed 200,000 miles.
The most frequently reported issues are AFM lifter failure, exhaust manifold bolt breakage, and water pump leaks. These are well-documented in GM service bulletins. Oil consumption within GM's published limits is also common and considered normal for this engine design.
The L92 was used in top-trim levels of GM's full-size SUVs from 2007 to 2010, specifically the Chevrolet Tahoe LTZ, Chevrolet Suburban LTZ, GMC Yukon Denali, and Cadillac Escalade (including ESV and EXT variants). It was not used in pickup trucks or lower-trim SUVs.
Yes, the L92 responds very well to tuning. A simple ECU flash can disable AFM and yield gains of 15-25 horsepower. More significant power increases are possible with camshaft upgrades, which often necessitate disabling AFM entirely, and forced induction. The engine's robust internals can handle substantial power increases.
Official EPA estimates for vehicles with the L92 are approximately 14 mpg city and 20 mpg highway (16.8 L/100km city, 11.8 L/100km highway). Real-world economy is often lower, especially with larger vehicles like the Suburban or Escalade, typically ranging from 12-17 mpg (19.6 - 13.8 L/100km) combined.
No. The L92, like other GM small-block V8s with an overhead valve (OHV) design, is a non-interference engine. If the timing chain were to fail, the pistons and valves would not collide, preventing catastrophic internal engine damage.
GM mandates dexos1™ specification 5W-30 oil. This is critical for the proper operation and longevity of the Active Fuel Management (AFM) lifters and the variable valve timing (VVT) system. Using the correct oil is not optional for this engine.
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
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