The CADILLAC L3X is a 2,694 cc, V6 twin-turbocharged petrol engine produced between 2021 and 2025. It features DOHC, 24-valve configuration and General Motors' High Feature V6 architecture, delivering 279 kW (380 PS) and 527 Nm of torque. Its compact design and aluminum block construction provide strong low-RPM torque and responsive performance in luxury applications.
Fitted to the CT5-V Blackwing and CT4-V Blackwing, the L3X was engineered for high-performance driving and dynamic handling in Cadillac's flagship V-series sedans. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a three-way catalytic converter, enabling OBD-II and Euro 6 compliance across all production years.
One documented concern is premature turbocharger wastegate actuator wear, particularly on units produced before 2023, due to thermal cycling and carbon buildup. This issue, highlighted in General Motors Service Information Bulletin 13 01 25, led to boost control faults and reduced performance. In 2023, GM introduced a revised actuator with enhanced heat shielding and updated control logic to improve durability.
Cadillac
All production years 2021–2025 meet OBD-II and Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/6784).
The CADILLAC L3X is a 2,694 cc V6 twin-turbocharged petrol engine engineered for high-performance luxury sedan applications (2021–2025). It combines twin-scroll turbocharging with direct injection to deliver rapid boost response and track-capable power delivery. Designed to meet OBD-II and Euro 6 standards, it balances extreme performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,694 cc | |
| Fuel type | Petrol | |
| Configuration | V6, DOHC, 24-valve | |
| Aspiration | Twin-turbocharged | |
| Bore × stroke | 89.0 mm × 72.0 mm | |
| Power output | 279 kW (380 PS) @ 5,500 rpm | |
| Torque | 527 Nm @ 2,750–4,500 rpm | |
| Fuel system | Bosch direct injection (up to 200 bar) | |
| Emissions standard | OBD-II, Euro 6 | |
| Compression ratio | 10.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Twin-scroll turbochargers (Honeywell), ball-bearing design | |
| Timing system | Double-row timing chain | |
| Oil type | GM dexos1 Gen 3 (SAE 5W-30) | |
| Dry weight | 198 kg |
The twin-scroll turbo system provides strong low-RPM torque ideal for street and track use but requires strict adherence to 15,000 km oil change intervals to maintain chain and turbo longevity. GM dexos1 Gen 3 (5W-30) oil is critical due to its formulation supporting the timing chain and HPFP lubrication. Cold-start idling should be minimized to reduce wear on the turbo actuators. Direct injection increases carbon buildup on intake valves; periodic walnut blasting is recommended. Pre-2023 models should have the turbo actuator upgrade per GM SIB 13 01 25 if experiencing boost control faults. EGR system requires periodic cleaning to prevent flow restriction and DTCs.
Oil Specs: Requires GM dexos1 Gen 3 (5W-30) specification (GM SIB 11 04 14). Supersedes ACEA A5/B5 requirements.
Emissions: OBD-II and Euro 6 certification applies to all production years (2021–2025) (VCA Type Approval #VCA/EMS/6784).
Power Ratings: Measured under SAE J1349 standards. Output consistent across fuel qualities meeting ASTM D4814.
General Motors Technical Information System (TIS): Docs A34000, A34111, SIB 13 01 25
VCA Type Approval Database (VCA/EMS/6784)
SAE International: J1349 Engine Power Certification Standards
The CADILLAC L3X was used across CADILLAC's CT5-V Blackwing and CT4-V Blackwing platforms with longitudinal mounting. This engine received platform-specific adaptations-integrated oil cooler in the CT5-V Blackwing and revised intake manifolds in the CT4-V Blackwing-and from 2025 the CT5-V LCI adopted the L3X-T variant with updated engine management, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block near the timing cover (GM TIS A34090). The 8th VIN digit indicates engine family ('L' for L3X series). All L3X units have black valve covers with "3.0L" and "Blackwing" branding. Critical differentiation from L3X-T: Original L3X uses Motronic MEVD17.2 ECU with analog throttle, while L3X-T features MSV90 with drive-by-wire. Service parts require production date verification - turbo actuators before 06/2023 are prone to failure and should be replaced with post-revision units per GM SIB 13 01 25.
The L3X's primary reliability risk is turbocharger wastegate actuator wear on pre-2023 builds, with elevated incidence in stop-start urban use. Internal GM reports from 2022 indicated a significant number of pre-upgrade actuators failing before 100,000 km, while UK DVSA records show boost-related failures were common in city-driven examples. Frequent short trips and aggressive driving increase thermal stress, making cooling system maintenance and use of correct oil critical.
Analysis derived from GM technical bulletins (2021–2025) and UK DVSA failure statistics (2024–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CADILLAC L3X.
Comprehensive technical documentation and regulatory references
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CADILLAC 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
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