The GM L89 is a 6,162 cc, naturally aspirated V8 petrol engine produced between 2019 and present. It features dual overhead camshafts (DOHC), direct fuel injection, and variable valve timing (VVT) on both intake and exhaust camshafts. This architecture delivers a blend of high power output and refined operation, producing 313 kW (420 PS) and 569 Nm of torque in standard applications.
Fitted primarily to the Chevrolet Silverado 1500 and GMC Sierra 1500 full — size pickup tr…
Production years 2019–Present meet EPA Tier 3 Bin 125 and California LEV III ULEV125 standards (EPA Certificate of Conformity #A-1235-19).
The GM L89 is a 6,162 cc V8 naturally aspirated petrol engine engineered for full-size trucks and luxury sedans (2019-Present). It combines direct injection with dual overhead camshafts and advanced cylinder deactivation to deliver effortless power and respectable fuel efficiency for its size. Designed to meet EPA Tier 3 and California LEV III standards, it balances performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,162 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 103.25 mm × 92.0 mm | |
Power output | 313 kW (420 PS) @ 5,600 rpm | |
Torque | 569 Nm @ 4,100 rpm | |
Fuel system | Direct Injection (SIDI) | |
Emissions standard | EPA Tier 3 Bin 125 / CA LEV III ULEV125 | |
Compression ratio | 11.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC | |
Oil type | dexos1™ Gen 2 (SAE 0W-20) | |
Dry weight | 209 kg |
The GM L89 was introduced as a premium engine option for GM's full-size T1XX platform trucks and the CT6 luxury sedan with longitudinal mounting. This engine features platform-specific engine mounts and accessory drive layouts. All applications share identical core engine specifications and calibration, with the CT6 featuring a unique exhaust system for acoustic tuning. All adaptations are documented in OEM technical bulletins.
The L89's primary documented focus is on the seamless operation of its Dynamic Fuel Management (DFM) system, with no widespread mechanical failure campaigns issued. GM engineering data indicates robust performance under normal operating conditions, while adherence to the specified dexos1™ oil is critical for maintaining lifter function and preventing DFM-related drivability issues. Neglecting oil changes or using incorrect oil specifications is the primary factor leading to potential DFM system faults.
Analysis derived from GM technical bulletins (2019-Present) and NHTSA consumer complaint data (2019-2024). 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 GM L89 is generally considered a robust and reliable engine for long-term use. Its naturally aspirated V8 design is proven and durable. The primary focus for longevity is strict adherence to oil change intervals using only dexos1™ Gen 2 oil to ensure the Dynamic Fuel Management system operates correctly. With proper maintenance, it should provide many years of dependable, powerful service.
The most commonly discussed issue is related to the Dynamic Fuel Management (DFM) system, which can cause drivability complaints or check engine lights if solenoids or lifters fail. Carbon buildup on intake valves (common to direct injection engines) and coolant leaks from the water pump are also known, repairable issues.
The L89 6.2L V8 is used in the Chevrolet Silverado 1500 (High Country, LTZ Premium Plus), GMC Sierra 1500 (Denali, AT4 Premium), and was also available in the Cadillac CT6 (Premium Luxury, Platinum) for the 2019-2020 model years.
Yes, the L89 responds very well to tuning. ECU remaps can typically unlock an additional 20-30 kW and 40-60 Nm by optimizing ignition timing and fuel maps. More significant gains are possible with a performance exhaust and intake. Its large displacement and robust internals offer excellent tuning potential.
Fuel economy varies by model, drivetrain, and trim. For a 2023 Chevrolet Silverado 1500 4WD with the L89, EPA estimates are approximately 14.7 L/100km city, 11.2 L/100km highway, and 13.1 L/100km combined (16/21/18 mpg US). Real-world figures will depend heavily on driving habits and payload.
Yes. The GM L89 is an interference engine. This means that if the timing chain were to fail or jump significantly, the pistons could collide with the open valves, resulting in severe internal engine damage requiring a costly rebuild or replacement.
GM mandates the use of dexos1™ Gen 2 specification oil, typically in 0W-20 viscosity. Using any other oil, including older dexos1™ or non-dexos oils, can void the warranty and potentially lead to DFM system malfunctions or engine damage. Always check your owner's manual for the exact specification.
Comprehensive technical documentation and regulatory references
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GM Official Site
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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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