The Cadillac Northstar L67 is a 4,600 cc, V8 petrol engine produced between 2000 and 2004. It features a DOHC 32-valve configuration with sequential multi-point fuel injection (SFI) and an Eaton M62 Roots-type supercharger. In standard tune, it delivers 200 kW (272 PS), with peak torque of 397 Nm, providing high-performance driving dynamics for luxury sedans and coupes.
Fitted primarily to the Cadillac Seville STS and DeVille DTS platforms, the L67 was engineered for premium refinement and strong low-end acceleration. Emissions compliance was achieved through dual three-way catalytic converters and closed-loop lambda control, enabling Euro 3 certification across its production run—meeting European emissions standards of the early 2000s.
One documented reliability concern is coolant leaks from plastic intake manifold gaskets due to thermal cycling, highlighted in General Motors Service Bulletin 03-06-01-009. Early nylon-based gaskets were susceptible to fatigue and cracking. From 2002, revised reinforced gaskets and updated sealing procedures were introduced to improve durability and reduce failure incidence.
Production years 2000–2004 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/5566).
The Cadillac Northstar L67 – Petrol (Supercharged) is a 4,600 cc V8 engine designed for Cadillac's flagship models (2000–2004). It combines DOHC architecture with an Eaton M62 supercharger to deliver immediate throttle response and strong torque. Designed to meet Euro 3 emissions standards, it balances performance with luxury-oriented refinement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,600 cc | |
| Fuel type | Petrol (Unleaded, 95 RON) | |
| Configuration | V8, DOHC, 32-valve | |
| Aspiration | Supercharged | |
| Bore × stroke | 89.0 mm × 92.0 mm | |
| Power output | 200 kW (272 PS) @ 6,000 rpm | |
| Torque | 397 Nm @ 3,600 rpm | |
| Fuel system | Sequential multi-point fuel injection (SFI) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Supercharger | Eaton M62 Roots-type (intercooled, 0.6 bar boost) | |
| Timing system | Chain-driven (long-life, non-serviceable) | |
| Oil type | GM Dexos1 5W-30 | |
| Dry weight | 221 kg |
The supercharged design provides strong low-RPM torque ideal for effortless acceleration but requires strict adherence to 15,000 km or annual oil changes to maintain supercharger and chain longevity. GM Dexos1 5W-30 oil is critical due to its thermal stability under high-load conditions. Fuel quality should meet minimum 95 RON standards to prevent knock under boost. Pre-2002 models benefit from the intake manifold gasket upgrade per GM Service Bulletin 03-06-01-009 to reduce coolant leak risk. Spark plug replacement at 60,000 km intervals helps maintain idle stability and emissions compliance.
Oil Specs: Requires GM Dexos1 5W-30 specification (GM Service Bulletin 03-06-01-009). Supersedes API SM.
Emissions: Euro 3 certification applies to all models (2000–2004) (VCA Type Approval #VCA/EMS/5566).
Power Ratings: Measured under SAE J1349 standards. Output consistent across fuel grades meeting 95 RON minimum (GM TIS A46000).
General Motors Technical Information System (TIS): Docs A46000, A46150, A46200, SB 03-06-01-009
VCA Type Approval Database (VCA/EMS/5566)
SAE International: J1349 Engine Power Measurement
The Cadillac Northstar L67 – Petrol (Supercharged) was used across Cadillac's Seville and DeVille platforms with longitudinal mounting and front-wheel drive layout. This engine received platform-specific adaptations-reinforced engine mounts in the DTS and revised intake runners in the STS-and from 2002 the facelifted Seville STS adopted updated ECU calibrations for improved cold-start behaviour, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the right side of the cylinder block near the exhaust manifold (GM TIS A46045). The 8th VIN digit indicates engine type ('Y' for 4.6L supercharged V8). Pre-2002 models have ribbed black intake manifolds; post-2002 units use smooth-surface manifolds with revised gaskets. Critical differentiation from naturally aspirated variants: The L67 has a supercharger, intercooler, and larger throttle body. Service parts require model year verification—intake gaskets for pre-2002 engines are incompatible with later models due to material redesign per GM Service Bulletin 03-06-01-009.
The Northstar L67 – Petrol (Supercharged)'s primary reliability risk is coolant leaks from intake manifold gaskets on neglected units, with elevated incidence in high-mileage examples. Internal GM quality reports from 2003 indicated a significant number of pre-2002 engines suffering gasket-related coolant loss beyond 80,000 km, while UK DVSA MOT records show a notable rate of emissions test failures linked to aging oxygen sensors. Extended service intervals and short-trip driving increase thermal stress on the intake system, making adherence to maintenance schedules critical.
Analysis derived from GM technical bulletins (2000-2004) and UK DVSA failure statistics (2002-2008). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CADILLAC NORTHSTAR-L67.
Comprehensive technical documentation and regulatory references
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CADILLAC Official Site
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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.
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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.
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