The Peugeot KF6 is a 2,946 cc, V6 naturally aspirated petrol engine produced between 1997 and 2001. It features an aluminium alloy block and heads with double overhead camshafts (DOHC) and four valves per cylinder. This engine, part of PSA's ES/L engine family co — developed with Renault, was designed for smooth, refined power delivery in executive vehicles.
Fitted primarily to the Peugeot 607 and Citroën C5, the KF6 was engineered for quiet, effortless cruising and stron…
Production years 1997–2001 meet Euro 3 standards for passenger vehicles (UTAC Type Approval).
The Peugeot KF6 is a 2,946 cc V6 naturally aspirated petrol engine engineered for executive sedans and estates (1997-2001). It combines sequential multi-point fuel injection with a DOHC 24-valve cylinder head to deliver smooth, linear power and refined operation. Designed to meet Euro 3 emissions standards, it prioritized NVH (Noise, Vibration, Harshness) refinement for luxury applications.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,946 cc | |
Fuel type | Petrol | |
Configuration | V6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 82.6 mm | |
Power output | 147 kW (200 PS) @ 6,000 rpm | |
Torque | 285 Nm @ 4,000 rpm | |
Fuel system | Sequential multi-point fuel injection (SAGEM) | |
Emissions standard | Euro 3 | |
Compression ratio | 10.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven (maintenance-free design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | Not available in public OEM docs |
The Peugeot KF6 was used primarily in Peugeot's flagship executive sedan with longitudinal mounting. This engine was the top petrol unit for the first-generation 607 and was also fitted to the equivalent Citroën C5 V6 models. 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 PSA technical bulletins (1997-2001) and aggregated data from Peugeot/Citroën owner club technical forums. 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 KF6 can be very reliable long-term if the known coolant system weaknesses are addressed proactively. Its main vulnerability is the plastic coolant components. By replacing these with revised parts and adhering to strict oil change intervals, these smooth V6 engines are known to exceed 200,000 km without major issues.
The most critical problem is coolant leaks from the plastic elbows and thermostat housing. Other common issues include failure of the variable intake manifold actuators, noisy hydraulic tappets, and ignition coil failure. All are well-documented in PSA service literature.
The KF6 engine is found in the Peugeot 607 (1999-2001) and the Citroën C5 V6 (2001, very limited production). It was the flagship 2.9L V6 petrol engine for these executive models, positioned above the 2.2L V6 and various four-cylinder units.
Aftermarket ECU tuning is common on the KF6 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.
Fuel economy is moderate for its size and power. Expect around 11.0-12.0 L/100km (26-24 mpg UK) in mixed driving for a Peugeot 607. Highway cruising can see figures closer to 8.5-9.5 L/100km (33-30 mpg UK), while city driving will consume significantly more, around 14.0-16.0 L/100km (20-18 mpg UK).
Yes. The KF6 is an interference engine. While it uses a timing chain designed for longevity, any failure of the chain or tensioner that causes timing to jump will result in piston-to-valve contact and severe internal engine damage.
PSA originally specified a 10W-40 mineral or semi-synthetic oil. A modern, high-quality 10W-40 full synthetic oil meeting ACEA A3/B3 specification is an excellent and recommended choice, offering better high-temperature protection and engine cleanliness, especially for an engine with hydraulic tappets.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
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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