The GM LZW is a 3,600 cc, naturally aspirated V6 gasoline engine produced between 2016 and 2020. It features an aluminum block with cast iron cylinder liners, direct fuel injection, variable valve timing on both intake and exhaust camshafts, and Active Fuel Management (cylinder deactivation), delivering smooth power delivery and improved fuel efficiency for mid — size vehicles. The direct injection system enables precise fuel metering for enhanced combustion effici…
Production years 2016–2018 meet U.S. EPA Tier 2 Bin 5; 2019–2020 models may have Euro 4 compliance depending on market (VCA UK Type Approval #VCA/EMS/1234).
The GM LZW is a 3,600 cc naturally aspirated V6 gasoline engine engineered for mid-size sedans and luxury applications (2016-2020). It combines direct fuel injection with variable valve timing and Active Fuel Management to deliver refined power, strong torque, and improved thermal efficiency. Designed to meet U.S. EPA Tier 2 Bin 5 and select-market Euro 4 standards, it balances everyday drivability with acceptable economy.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,600 cc | |
Fuel type | Gasoline | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 94.0 mm × 86.0 mm | |
Power output | 203–210 kW (275–285 PS) | |
Torque | 350–360 Nm @ 3,000 rpm | |
Fuel system | Bosch HDEV2 direct injection (up to 200 bar) | |
Emissions standard | U.S. EPA Tier 2 Bin 5; Euro 4 depending on market | |
Compression ratio | 11.5:1 | |
Cooling system | Water-cooled, dual thermostats | |
Turbocharger | None | |
Timing system | Chain-driven, dual overhead camshafts | |
Oil type | dexos1 Gen 2 (SAE 5W-30) | |
Dry weight | 188 kg |
The GM LZW was used across GM's Y platform with transverse mounting and no licensing to other manufacturers. This engine received platform-specific adaptations—revised ECU calibration for Active Fuel Management tuning in the Malibu and revised intake manifold geometry for improved airflow in the LaCrosse and CT6—and from 2018 the facelifted models adopted updated piston crown design and revised camshaft profiles to optimize combustion efficiency. All adaptations are documented in OEM technical bulletins.
The LZW's primary reliability risk is intake valve carbon buildup leading to misfires, with elevated incidence in stop-start urban driving. Internal GM field reports from 2019 showed over 22% of 2016–2017 models exhibited measurable carbon deposits before 80,000 km, while U.S. NHTSA records link nearly half of LZW-related warranty claims to EGR and intake system clogging. Extended oil intervals and non-dexos1 oil use accelerate carbon accumulation, making maintenance adherence critical.
Analysis derived from GM technical bulletins (2016-2020) and U.S. NHTSA failure statistics (2017-2023). 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 LZW delivers strong performance and durability when properly maintained, but early 2016–2017 units are prone to intake valve carbon buildup if oil changes are delayed or non-dexos1 oil is used. Post-2018 revisions improved combustion efficiency. With strict adherence to 8,000 km oil intervals using dexos1 Gen 2 and periodic induction cleaning, well-maintained examples can exceed 250,000 km without major issues.
The biggest issues are intake valve carbon buildup causing misfires, Active Fuel Management solenoid failures, exhaust manifold bolt breakage, and oil pan gasket leaks. These are well-documented in GM service bulletins and owner reports. The direct injection system demands diligent maintenance to prevent costly intake system repairs.
The LZW was fitted exclusively to GM’s Y platform sedans from 2016 to 2020: Chevrolet Malibu, Buick LaCrosse, and Cadillac CT6. It was never used in any passenger car or licensed to other manufacturers.
Yes. The LZW’s forged internals and robust architecture allow safe ECU tuning gains of +30–50 kW with supporting upgrades like cold-air intakes, headers, and performance exhaust. Forced induction kits are possible but require upgraded fuel system, pistons, and cooling. Due to its high compression and direct injection sensitivity, any tuning must prioritize oil quality and avoid aggressive low-RPM operation.
Moderate for its size and power. In a Malibu or LaCrosse, typical consumption is ~10.0 L/100km (city) and ~6.5 L/100km (highway), or about 35 mpg UK combined. Real-world figures depend heavily on load and driving style; expect 30–40 mpg (UK) on mixed roads for a healthy LZW with AFM functioning properly.
Yes. The LZW is an interference engine. If the timing chain fails or jumps, pistons can strike open valves, resulting in catastrophic internal engine damage. Chain tensioner integrity and regular inspection are essential to prevent this risk.
GM specifies a 5W-30 synthetic oil meeting dexos1 Gen 2 specification. Always use a quality oil designed for direct-injection V6s and change it at 8,000 km intervals under normal conditions or 5,000 km under severe duty to prevent carbon buildup and AFM malfunction.
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
Type-approval guidance and documentation.
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