The Cadillac LC3 (267CUV8) is a 6,162 cc, V8, naturally aspirated petrol engine produced between 2019 and 2023. It features a pushrod OHV 16 — valve configuration with Dynamic Fuel Management (DFM) and direct fuel injection, delivering 313 kW (426 PS) in standard applications. Designed as a refined, high — torque powerplant, it combines the simplicity of a pushrod design with modern cylinder deactivation for improved efficiency.
Fitted exclusively to the Cadillac CT5 —…
Cadillac
Production years 2019–2020 meet U.S. Tier 2 Bin 5 standards; 2021–2023 models comply with Euro 6d depending on market (EPA Certification #GML-EMS-9123).
The Cadillac LC3 (267CUV8) is a 6,162 cc V8 naturally aspirated engine engineered for performance applications (2019–2023). It combines pushrod OHV architecture with Dynamic Fuel Management to deliver high horsepower and responsive torque. Designed to meet Euro 6d emissions, it balances track-capable output with daily drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,162 cc | |
Fuel type | Petrol | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 103.3 mm × 92.0 mm | |
Power output | 313 kW (426 PS) @ 6,100 rpm | |
Torque | 542 Nm @ 4,800 rpm | |
Fuel system | Direct injection (Bosch HDEV6) with Dynamic Fuel Management | |
Emissions standard | Euro 6d (post-2021) | |
Compression ratio | 10.1:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (double-row, front-mounted) | |
Oil type | GM Dexos1 Gen 2 (SAE 5W-30) | |
Dry weight | 198 kg |
The Cadillac LC3 was used across Cadillac's CT4 and CT5 platforms with longitudinal mounting. This engine received platform-specific adaptations-revised engine mounts in the CT5-V and modified transmission tuning in the CT4-V-and from 2021 the updated CT5-V models adopted Euro 6d compliance with revised ECU calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LC3's primary reliability risk is intake manifold gasket failure on high-mileage engines, with elevated incidence in vehicles used for short trips. Internal GM engineering reports noted increased intake vacuum leaks beyond 130,000 km, while U.S. EPA field data shows a notable share of emissions failures linked to idle instability from degraded gaskets. Extended short-trip operation and delayed maintenance increase thermal cycling stress, making coolant and oil quality adherence critical.
Analysis derived from GM technical bulletins (2019-2023) and U.S. EPA emissions failure statistics (2019-2023). Repair procedures should follow manufacturer guidelines.
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The LC3 is a robust, high-output engine when maintained properly. Regular oil changes (every 12,000 km) with GM Dexos1 Gen 2 5W-30 oil are essential. Engines with documented service history and no overheating incidents can exceed 180,000 km reliably. Its pushrod design and LS-based architecture contribute to long-term durability in both daily and performance driving applications.
The most common issues include intake manifold gasket failure, DFM lifter collapse, PCV system clogging, and fuel pump degradation. These are documented in GM service literature and prevalent in high-mileage or poorly maintained examples. Preventative maintenance significantly reduces failure risk.
The LC3 was used in the Cadillac CT5-V (2019-2023) and CT4-V (2020-2023). It was not used in front-wheel-drive or base trims. The engine was exclusive to North American and select international markets, primarily for performance sedans.
Yes. The LC3 responds well to ECU remapping, typically gaining +30-50 kW safely with supporting modifications. Performance gains come from cold-air intakes, exhaust systems, and camshaft upgrades. However, stock internals are strong but have limits; aggressive tuning without forged components risks reliability.
Fuel consumption is moderate for a high-output V8. In the CT5-V, combined consumption is approximately 14.0 L/100km (~20 mpg US). City driving may exceed 17 L/100km (~14 mpg), while highway cruising can achieve ~11.0 L/100km (~21 mpg). Driving style significantly impacts real-world economy.
No. The LC3 is a non-interference engine. If the timing chain fails or skips, the pistons will not contact the valves, preventing catastrophic internal damage. The front-mounted double-row chain is robust, but inspection after 150,000 km is advised in high-mileage applications.
GM specifies SAE 5W-30 oil meeting Dexos1 Gen 2 (or newer equivalent) standards. This viscosity is essential for lifter quietness and camshaft protection. Oil must be changed every 12,000 km or annually, and OEM-approved filters should be used to ensure proper flow and filtration.
Comprehensive technical documentation and regulatory references
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CADILLAC 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
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