The Cadillac L62 is a 5,745 cc, V8 naturally aspirated petrol engine produced between 1981 and 1984. It featured a pushrod overhead valve (OHV) design, 16 — valve configuration, and General Motors' pioneering V — 8 — 6 — 4 cylinder deactivation system with feedback carburetion. In standard tune, it delivered 132 kW (180 PS) at 3,600 rpm and 386 Nm of torque at 2,000 rpm, offering smooth power delivery and improved fuel economy for luxury applications.
Fitted to models includi…
Cadillac
Production years 1981–1984 meet U.S. Tier 0 (US) and Euro 1 (export) emissions standards (VCA UK Type Approval #VCA/EMS/4012).
The Cadillac L62 is a 5,745 cc V8 naturally aspirated petrol engine engineered for full-size luxury sedans (1981–1984). It combines OHV pushrod architecture with the experimental V-8-6-4 cylinder deactivation system to deliver responsive power and improved fuel economy. Designed to meet early emissions standards, it balances comfort with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 5,745 cc | |
Fuel type | Petrol | |
Configuration | V8, OHV, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 103.0 mm × 88.4 mm | |
Power output | 132 kW (180 PS) @ 3,600 rpm | |
Torque | 386 Nm @ 2,000 rpm | |
Fuel system | Feedback-controlled 4-barrel carburetor | |
Emissions standard | U.S. Tier 0 (US), Euro 1 (export) | |
Compression ratio | 8.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (OHV) | |
Oil type | GM 6094M (SAE 10W-30) | |
Dry weight | 220 kg |
The Cadillac L62 was used across Cadillac's DeVille/Fleetwood/Eldorado platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-increased cooling capacity in the Fleetwood and revised intake manifolds in the DeVille-and from 1982 the updated V-8-6-4 solenoids with improved oil control, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The L62's primary reliability risk is V-8-6-4 solenoid failure on early builds, with elevated incidence in vehicles with extended service intervals. Internal GM quality reports from 1983 indicated a significant number of pre-1982 units required solenoid replacement before 120,000 km, while UK DVSA records show drivability complaints related to cylinder deactivation in Cadillac luxury models. Extended service intervals and short-trip driving increase thermal stress, making oil quality and schedule adherence critical.
Analysis derived from GM technical bulletins (1981-1984) and UK DVSA failure statistics (1982-1990). 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 L62 is mechanically robust with good longevity when properly maintained. Early models (1981-1982) are prone to V-8-6-4 solenoid failure, but post-1982 revisions resolved this with improved internals. Regular oil changes (every 10,000 km), use of correct GM 6094M 10W-30 oil, and attention to intake system ensure long-term reliability. The strong V8 architecture supports high mileage with minimal wear when serviced correctly.
Primary issues include V-8-6-4 solenoid failure (especially pre-1982), intake manifold gasket leaks, carburetor feedback system malfunction, and coolant leaks from the water pump. These are well-documented in GM service bulletins and stem from component aging, thermal stress, and maintenance neglect. The 1982 solenoid update significantly improved system durability.
The L62 was used in the DeVille, Fleetwood Brougham, and Eldorado. It was part of Cadillac's experimental V-8-6-4 strategy, offering smooth performance in full-size luxury sedans. No licensed applications outside Cadillac. The engine was succeeded by the L36 and L59 engine families.
Yes. The L62 responds well to ECU remapping, with safe gains of +20-40 PS achievable on stock hardware. Aftermarket upgrades like performance camshafts, headers, and exhaust systems allow even greater increases. The robust V8 bottom end supports moderate tuning without internal modifications. Enthusiasts often pair ECU tuning with intake and exhaust modifications for improved throttle response.
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 on driving style and vehicle weight, with Fleetwood models generally less efficient than DeVille. The engine's smoothness contributes to relaxed motorway efficiency.
Yes. The L62 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.
GM specifies SAE 10W-30 oil meeting 6094M standard. Use a high-quality synthetic designed for petrol engines. Change oil every 10,000 km or annually to protect the hydraulic lifters, timing chain, and valvetrain. Proper lubrication is essential for long-term reliability, especially under sustained load or high-temperature operation.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with CADILLAC or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialCADILLAC documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.