The Citroen EP6CDT is a 1,598 cc, inline-three turbocharged petrol engine produced between 2010 and 2018. It forms part of the PSA-BMW joint EP6 engine family, featuring a single overhead camshaft (SOHC), 12-valve configuration, and direct fuel injection. In standard tune, it delivers 115 kW (156 PS), providing strong low-end torque and responsive performance for compact and performance-oriented platforms such as the DS4 and C4 Picasso.
Fitted to models such as the DS4, C4, and C5 Aircross, the EP6CDT was engineered for dynamic driving with a balance of refinement and efficiency. Emissions compliance was achieved through exhaust gas recirculation (EGR), a three-way catalytic converter, and precise direct injection, allowing it to meet Euro 5 standards throughout its production run. Its design prioritises power density and drivability in transverse-mounted applications.
One documented concern is premature turbocharger bearing wear, particularly in early production units, highlighted in PSA Technical Service Bulletin TSB-ENG-1015. This issue is typically linked to oil starvation or delayed oil changes. Later production revisions incorporated improved oil feed geometry and updated turbocharger cartridges to enhance durability.
Production years 2010–2018 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/9012).
The Citroen EP6CDT is a 1,598 cc inline-three turbocharged petrol engine engineered for B- and C-segment platforms (2010–2018). It combines direct fuel injection with a variable-geometry turbocharger to deliver strong low-RPM performance. Designed to meet Euro 5 standards, it balances sporty character with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-3, SOHC, 12-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 85.0 mm × 94.6 mm | |
| Power output | 115 kW (156 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 1,400–4,000 rpm | |
| Fuel system | High-pressure direct injection (up to 150 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Variable geometry turbo (VGT, Honeywell) | |
| Timing system | Timing belt (interval: 90,000 km or 5 years) | |
| Oil type | SAE 5W-30 (ACEA C3) | |
| Dry weight | 108 kg |
The turbocharged SOHC design provides strong low-RPM torque ideal for responsive driving but requires strict adherence to 90,000 km or 5-year timing belt replacement intervals to prevent valve damage. SAE 5W-30 oil meeting ACEA C3 is essential for turbocharger and direct injection system longevity. Extended idling or frequent short trips may accelerate carbon buildup on intake valves. The direct injection system is sensitive to fuel quality; use of low-sulfur petrol (EN 228) is recommended. Pre-2014 units should have turbo oil feed inspected per PSA TSB-ENG-1015.
Oil Specs: Requires SAE 5W-30 meeting ACEA C3 specification (PSA SIB 10 15 01). Compatible with BMW Longlife-04 in turbocharged applications.
Emissions: Euro 5 certification applies to all models (2010–2018) (VCA Type Approval #VCA/EMS/9012).
Power Ratings: Measured under ISO 1585 standards. Output consistent across fuel grades meeting EN 228.
PSA Technical Information System (TIS): Docs EP6CDT-001, EP6CDT-002, EP6CDT-003, TSB-ENG-1015
VCA Type Approval Database (VCA/EMS/9012)
ISO International: ISO 1585 Road vehicles — Passenger cars — Test code for determination of net power
The Citroen EP6CDT was used across Citroen's DS4/C4 platforms with transverse mounting and co-developed with BMW under shared EP6 architecture. This engine received platform-specific adaptations-reinforced mounts in the DS4 and revised intake manifolds in the C5 Aircross-and from 2014 the facelifted DS4 models adopted updated engine management software, creating minor calibration differences. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block near the starter motor (PSA TIS EP6-1598). The 8th VIN digit indicates engine type ('P' for EP6CDT). Pre-2014 models have silver valve covers; post-2014 units use black valve covers. Critical differentiation from EP3: EP6CDT uses a variable geometry turbocharger with direct injection, while EP3 is naturally aspirated. Service parts require production date verification - turbo oil feed lines for pre-2014 models are incompatible with later revisions due to internal redesign (PSA SIB 11 06 15).
The EP6CDT's primary reliability risk is turbocharger bearing wear on early builds, with elevated incidence in urban use with extended oil intervals. Internal PSA quality reports from 2015 indicated a significant number of pre-2014 engines requiring turbo replacement before 100,000 km, while UK DVSA records show timing belt neglect as a leading cause of engine seizure. Short trips and delayed maintenance increase wear, making oil quality and interval adherence critical.
Analysis derived from PSA technical bulletins (2010-2018) and UK DVSA failure statistics (2012-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN EP6CDT.
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