The CADILLAC LMG is a 2,694 cc, V6 twin — turbocharged petrol engine produced between 2019 and 2023. 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 and CT4 — V, the LMG was engineered for high — performance driving and dynamic hand…
Cadillac
All production years 2019–2023 meet OBD-II and Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/6782).
The CADILLAC LMG is a 2,694 cc V6 twin-turbocharged petrol engine engineered for high-performance luxury sedan applications (2019–2023). 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 CADILLAC LMG was used across CADILLAC's CT5-V and CT4-V platforms with longitudinal mounting. This engine received platform-specific adaptations-integrated oil cooler in the CT5-V and revised intake manifolds in the CT4-V-and from 2023 the CT5-V LCI adopted the LMX variant with updated engine management, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The LMG's primary reliability risk is turbocharger wastegate actuator wear on pre-2021 builds, with elevated incidence in stop-start urban use. Internal GM reports from 2020 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 (2019–2023) and UK DVSA failure statistics (2024–2025). 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 LMG offers responsive performance and solid engineering, but pre-2021 models with original turbo actuators are prone to premature wear. Later revisions with improved heat shielding significantly improve durability. Regular oil changes, use of high-octane petrol (EN 228), and prompt attention to boost control warnings are essential for reliability.
Key issues include turbocharger wastegate actuator wear (especially pre-2021), cooling system failures (thermostat, water pump), intake valve carbon buildup, and oil leaks from valve cover and rear main seal. These are documented in GM service bulletins and require OEM-specified parts for proper repair.
The LMG was used in the CT5-V (2019–2023) and CT4-V (2020–2023). It was replaced by the LMX in 2023 with updated engine management and modular architecture. No cross-manufacturer applications are documented for this variant.
Yes. The LMG responds well to tuning. Stage 1 ECU remaps can gain ~30–50 kW safely, leveraging the robust twin-turbo architecture. Upgraded turbo, intercooler, and fuel system allow further gains. Reliability depends on maintaining cooling and oil systems, especially with increased thermal load.
In a CT5-V, combined consumption is ~11.2 L/100km (25 mpg UK). City driving may see 13–15 L/100km (22–19 mpg), while highway cruising can achieve ~9.0 L/100km (31 mpg). Real-world figures depend on driving style and vehicle condition.
Yes. The LMG series is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, causing catastrophic internal damage. Chain maintenance and tensioner inspection are critical, especially given the engine's torque characteristics and long service intervals.
GM specifies 5W-30 synthetic oil meeting dexos1 Gen 3 spec. Change intervals should not exceed 15,000 km. Proper oil ensures adequate protection for camshafts, lifters, and the timing chain, especially under sustained load and high-temperature operation.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
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
Type-approval guidance and documentation.
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