The Cadillac LT4 Blackwing is a 6,162 cc, V8 supercharged petrol engine produced from 2016 onwards. It features dual overhead camshafts (DOHC), 32 — valve configuration, and General Motors' Active Fuel Management (AFM) system with continuously variable valve timing. In standard tune, it delivers 477 kW (650 PS) at 6,400 rpm and 850 Nm of torque at 3,600–5,200 rpm, offering extreme performance and refinement for high — performance luxury applications.
Fitted to models i…
Production years 2016–present meet Euro 6d emissions standards .
The Cadillac LT4 Blackwing is a 6,162 cc V8 supercharged petrol engine engineered for high-performance luxury applications (2016–present). It combines forced induction with cylinder deactivation to deliver responsive power and improved fuel economy. Designed to meet Euro 6d standards, it balances performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,162 cc | |
Fuel type | Petrol | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Supercharged | |
Bore × stroke | 103.3 mm × 92.0 mm | |
Power output | 477 kW (650 PS) @ 6,400 rpm | |
Torque | 850 Nm @ 3,600–5,200 rpm | |
Fuel system | Direct injection with port assist (DPI+) | |
Emissions standard | Euro 6d | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Supercharger | Twin-volute Eaton TVS R1740 (1.7L) with electric bypass valve | |
Timing system | Double-row roller chain (DOHC) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 218 kg |
The Cadillac LT4 Blackwing was used across Cadillac's CTS/CT5 platforms with longitudinal mounting and no licensed external applications. This engine received model-specific adaptations-increased cooling capacity in the CT5-V and revised intake manifolds in the CTS-V-and from 2018 the updated supercharger tensioner with improved heat resistance, creating strict interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The LT4 Blackwing is a motorsport-derived engine designed for high-stress environments. Early data from 2016–2025 shows excellent reliability when maintained per Cadillac specifications. No widespread durability issues have been reported. Regular oil changes (every 15,000 km), use of correct GM dexos1 Gen 3 oil, and adherence to warm-up/cool-down procedures ensure long-term reliability. The engine's forged internals and robust block support high performance with minimal wear when serviced correctly.
Primary concerns include supercharger drive belt tensioner failure (especially pre-2018), fuel injector coking from low-quality fuel, and valve stem seal wear under sustained high-RPM use. These are anticipated in high-performance operation and are addressed through preventive maintenance per GM service guidelines.
The LT4 Blackwing is currently used exclusively in the CTS-V and CT5-V. It is Cadillac's high-output supercharged V8 developed specifically for their top-tier performance luxury models. No other Cadillac production vehicles use this engine. It is not available in the standard CTS or CT5. The engine was not licensed to any other manufacturer.
Aftermarket ECU tuning is common on the LT4-BLACKWING platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In combined driving, expect 15.0–18.0 L/100km (19–16 mpg UK). Highway cruising can achieve ~13.0 L/100km (~22 mpg UK), while city driving may exceed 20.0 L/100km (14 mpg UK). Real-world figures depend heavily on driving style, with CT5-V models generally less efficient than CTS-V. The engine's performance focus prioritizes power over efficiency.
Yes. The LT4 Blackwing is an interference engine. If the timing chain fails or skips, pistons will contact open valves, causing catastrophic internal damage. While the double-row roller chain is durable, any signs of rattle or tensioner wear should be investigated immediately to prevent engine seizure. Regular oil changes help maintain chain tensioner function and lubrication under high-RPM conditions.
GM specifies SAE 5W-30 oil meeting dexos1 Gen 3 standard. Use only high-quality synthetic designed for high-performance petrol engines. Change oil every 15,000 km or annually to protect supercharger, valvetrain, and timing chain. Proper lubrication is essential for long-term reliability, especially under sustained load or track operation.
Comprehensive technical documentation and regulatory references
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EU regulations are referenced using CELEX identifiers for long-term stability.
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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