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-V and CT4-V performance sedans, the LC3 was engineered to deliver linear power delivery and strong low-end torque for spirited driving. Emissions compliance was achieved through advanced oxygen sensor feedback, catalytic converters, and Dynamic Fuel Management, enabling it to meet U.S. Tier 2 Bin 5 and Euro 6d standards in export markets.
One documented update occurred in 2021, referenced in GM Service Bulletin #10742, which revised the engine control module (ECM) calibration to improve DFM transition smoothness and reduce intake manifold carbon buildup. This change addressed early reports of hesitation during cylinder deactivation and enhanced long-term reliability across the model line.
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 pushrod V8 layout with DFM provides high horsepower and linear power delivery ideal for spirited driving but requires adherence to maintenance schedules to sustain longevity. GM Dexos1 Gen 2 (5W-30) oil is recommended for optimal lifter and camshaft lubrication. Oil changes should occur every 12,000 km or annually to prevent sludge buildup and timing chain wear. The DFM system relies on precise oil pressure and lifter function; degraded oil or extended intervals can trigger DFM disengagement and reduced fuel economy. Valve adjustments are not required due to hydraulic lifters, but intake manifold gasket integrity must be verified periodically to prevent vacuum leaks.
Oil Specs: Requires GM Dexos1 Gen 2 (5W-30) specification (GM Service Bulletin 10742). Compatible with API SN/SP requirements.
Emissions: Euro 6d certification applies to post-2021 export models only (EPA Certification #GML-EMS-9123). Pre-2021 units meet U.S. Tier 2 Bin 5 standards.
Power Ratings: Measured under SAE J1349 standards. Output achieved with 91 AKI fuel and optimal ignition timing (GM TIS Doc. ALC3PERF).
General Motors Technical Information System (TIS): Docs ALC3, ALC3FUEL, ALC3TIMING
EPA Certification Database (GML-EMS-9123)
SAE International: J1349 Engine Power Measurement Standard
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.
Locate the engine code stamped vertically on the right-side of the cylinder block, near the exhaust manifold (GM TIS ALC3ID01). The 8th VIN digit indicates engine family ('U' for LC3 series). Pre-2021 models have a composite intake manifold with square throttle body; the 2021+ variant features revised DFM solenoid placement and updated ECU mapping. Critical differentiation from LT1: LC3 has lower-flow cylinder heads and different camshaft profile. Service parts require model-year verification—intake manifolds, camshafts, and ECUs are not interchangeable between LT1 and LC3 variants (GM TIS ALC3).
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.
Find answers to most commonly asked questions about CADILLAC LC3.
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Regulation (EC) No 715/2007
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