The Citroën 5FM (engine code EP6CDT) is a 1,598 cc, inline — four turbocharged petrol engine developed by PSA Group in partnership with BMW, produced between 2010 and 2018. It features direct fuel injection (THP), twin — scroll turbocharging, and dual overhead camshafts (DOHC). This configuration delivers strong low — end torque and responsive throttle characteristics for compact and performance — oriented applications.
Fitted to models such as the Citroën C4 Picasso…
Production years 2010–2015 meet Euro 5 standards; 2016–2018 models comply with Euro 6b depending on market .
The Citroën 5FM (EP6CDT) is a 1,598 cc inline-four turbocharged petrol engine engineered for premium compact models (2010–2018). It combines direct fuel injection (THP) with a twin-scroll turbocharger to deliver responsive throttle delivery and strong mid-range performance. Designed to meet Euro 5 and later Euro 6b standards, it balances sporty driving dynamics with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 77.0 mm × 85.8 mm | |
Power output | 147 kW (200 PS) @ 5,500 rpm | |
Torque | 275 Nm @ 1,900–4,500 rpm | |
Fuel system | High-pressure direct injection (Delphi GDi, up to 150 bar) | |
Emissions standard | Euro 5 (2010–2015); Euro 6b (2016–2018) | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled | |
Turbocharger | Honeywell twin-scroll turbo with vacuum-actuated wastegate | |
Timing system | Timing chain (non-interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 122 kg |
The Citroën 5FM (EP6CDT) was used across Citroën's PF2/PF3 platforms with transverse mounting and shared with DS Automobiles for premium applications. This engine received platform-specific adaptations-shorter intake runners in the DS4 and revised cooling ducting in the DS5-and from 2016 the facelifted C4 Picasso adopted the EP6CDTR variant with enhanced thermal management, creating interchange limits. Shared engineering with BMW's N13 engine allowed cross-OEM service insights. 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 EP6CDT offers strong performance but pre-2014 models are prone to turbo actuator issues. Later revisions (post-2014) improved actuator durability, so well-maintained examples can exceed 150,000 km. Regular servicing, use of RON 98 fuel, and adherence to 15,000 km oil intervals with PSA B71 2290 oil are essential for longevity.
Key issues include turbo wastegate actuator binding, high-pressure fuel pump wear, intake valve carbon buildup, and timing chain tensioner rattle. These are documented in PSA service bulletins. Lambda sensor degradation and ECU software glitches are also reported in high-mileage units.
The EP6CDT was used in the Citroën C4 Picasso (B7) THP 200 (2010–2018), DS4 Performance Line (2011–2015), and DS5 petrol variants (2011–2015). It was also shared with Peugeot 308 GT models. All units from 2010–2015 met Euro 5; 2016–2018 models comply with Euro 6b.
Aftermarket ECU tuning is common on the 5FM-EP6CDT 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 a C4 Picasso THP 200, combined consumption is ~7.8 L/100km (36 mpg UK). Real-world figures vary: city driving may see 9–10 L/100km, while highway runs can achieve 6.5 L/100km (43 mpg UK). Driving style and transmission type significantly influence economy.
No. The EP6CDT uses a non-interference timing chain design. If the chain skips or breaks, piston-to-valve contact is avoided, preventing catastrophic engine damage. However, replacement is still critical to maintain valve timing and prevent drivability issues.
PSA specifies 5W-30 oil meeting PSA B71 2290 standard. This synthetic oil is formulated for turbocharged direct-injection engines and must be used to protect the HPFP and turbo. Change every 15,000 km or annually to ensure optimal component life.
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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