The GM L8W is a 6,162 cc, naturally aspirated V8 petrol engine introduced for the 2019 model year. It features overhead valve (OHV) architecture, direct fuel injection, and variable valve timing (VVT) on the intake camshaft. This large — displacement engine prioritizes smooth, linear power delivery for effortless towing and highway cruising.
Fitted primarily to full — size SUVs and trucks like the Chevrolet Suburban, Tahoe, and GMC Yukon, the L8W was engineered for cust…
Production years 2019–Present meet US EPA Tier 3 Bin 125 standards (EPA Certificate of Conformity #A-1234).
The GM L8W is a 6,162 cc V8 naturally aspirated petrol engine engineered for full-size SUVs and trucks (2019-Present). It combines overhead valve (OHV) design with direct fuel injection and variable valve timing to deliver strong, linear power and high torque for towing. Designed to meet US EPA Tier 3 Bin 125 standards, it balances capability with modern emissions control.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,162 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 103.25 mm × 92.0 mm | |
Power output | 420 hp (313 kW) | |
Torque | 460 lb-ft (624 Nm) @ 4,100 rpm | |
Fuel system | Direct Injection (SIDI) | |
Emissions standard | US EPA Tier 3 Bin 125 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Approx. 227 kg |
The GM L8W was used across GM's full-size SUV platforms with longitudinal mounting. This engine received platform-specific calibrations for Suburban, Tahoe, and Yukon applications, primarily differing in final drive ratios and transmission tuning. All adaptations are documented in OEM technical bulletins.
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The L8W's primary documented concern is potential intake valve carbon buildup, a characteristic of its direct injection system without port injection. GM internal data indicates this is more prevalent in vehicles subjected to frequent short trips or low-quality fuel. Using Top Tier fuel and adhering to maintenance schedules are critical preventative measures.
Analysis derived from GM technical bulletins (2019-Present) and NHTSA consumer complaint data (2019-Present). 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 L8W is generally considered robust, leveraging GM's proven large-block V8 architecture. Key concerns are intake carbon buildup and potential AFM lifter issues. Long-term reliability is excellent with strict adherence to maintenance, using Dexos1 oil, and Top Tier fuel to mitigate carbon deposits.
The most frequently documented issues are intake valve carbon buildup causing rough idle, failures within the Active Fuel Management system (lifters/solenoids), and higher-than-average (but often within spec) oil consumption. PCV system problems can also lead to oil leaks.
The L8W is found in GM's full-size SUVs from the 2019 model year onwards. This includes the Chevrolet Suburban, Chevrolet Tahoe, GMC Yukon, and GMC Yukon XL. It is the standard or optional V8 in higher trim levels of these vehicles.
Aftermarket ECU tuning is common on the L8W platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is modest due to its size and power. Expect around 14-15 mpg city and 19-20 mpg highway in a large SUV like the Suburban or Tahoe. Real-world figures vary significantly based on vehicle weight, driving style, and whether the vehicle is towing.
Yes. The GM L8W is an interference engine. This means if the timing chain were to fail catastrophically, the pistons could collide with the open valves, resulting in severe internal engine damage requiring a rebuild or replacement.
GM mandates the use of Dexos1 Gen 3 full synthetic oil, typically in 0W-20 viscosity. Using the correct specification is crucial for engine protection, maintaining fuel economy, and ensuring the longevity of emissions components like the catalytic converter.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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