The Citroën EP6DT is a 1,598 cc, inline-three turbocharged petrol engine produced between 2010 and 2018. It belongs to the PSA EP6 engine family, co-developed with BMW, featuring a DOHC 12-valve configuration and direct fuel injection. Delivering 115 kW (156 PS) at 5,500 rpm and 240 Nm of torque at 1,400 rpm, it provides strong low-end pulling power ideal for compact and performance-oriented vehicles.
Fitted to core models such as the C4 Picasso, DS4, and C4 Cactus, the EP6DT was engineered for responsive driving dynamics and high specific output in transverse-mounted applications. Emissions compliance was achieved through a three-way catalytic converter, direct injection, and closed-loop lambda control, allowing it to meet Euro 5 standards across its production run.
One documented concern involves premature wear of the timing chain tensioner, particularly in vehicles with extended service intervals. This issue, referenced in PSA Technical Service Bulletin TSB 10-10-06, is attributed to inadequate oil pressure supply at idle in early production units. A revised tensioner and oil pump introduced in 2013 improved reliability, reducing failure incidence in later builds.
Production years 2010–2018 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/7892).
The Citroën EP6DT is a 1,598 cc inline-three turbocharged petrol engine developed for compact and premium applications (2010–2018). It features a DOHC 12-valve layout with direct injection and twin-scroll turbocharging, delivering strong low-RPM torque and sporty performance. Designed to meet Euro 5 emissions standards, it balances driving excitement with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-3, DOHC, 12-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 115 kW (156 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 1,400–4,000 rpm | |
| Fuel system | Bosch HDEV5 direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbo (Mitsubishi) | |
| Timing system | Timing chain (interval: 160,000 km or 8 years) | |
| Oil type | SAE 5W-30, ACEA C3 | |
| Dry weight | 108 kg |
The DOHC 12V turbocharged design provides strong low-RPM torque ideal for spirited driving but requires strict adherence to 160,000 km or 8-year timing chain inspection intervals to prevent valve damage. SAE 5W-30 ACEA C3 oil is essential to maintain hydraulic tensioner function and prevent premature chain slippage. Extended oil change intervals can accelerate tensioner wear; annual changes are advised. The Bosch HDEV5 direct injection system is robust but benefits from periodic injector cleaning to prevent carbon buildup on intake valves. Post-2013 models feature a revised tensioner and oil pump; pre-2013 units should verify tensioner condition during major services. Turbocharger longevity depends on proper cooldown after high-load driving.
Oil Specs: Requires SAE 5W-30, ACEA C3 specification (PSA SIB 10-10-06). Low-SAPS formulation required for compatibility with emissions systems.
Emissions: Euro 5 certification applies to all EP6DT models (VCA Type Approval #VCA/EMS/7892).
Power Ratings: Measured under ISO 1585 standards. Output achieved with 95 RON fuel (PSA TIS Doc. EP606).
PSA Technical Information System (TIS): Docs EP600, EP601, EP605, TSB 10-10-06
VCA Type Approval Database (VCA/EMS/7892)
ISO International: ISO 1585 Road vehicles — Passenger cars — Test method for the measurement of specific power consumption
The Citroën EP6DT was used across Citroën's DS and compact platforms with transverse mounting and shared within the PSA Group for Peugeot applications. This engine received platform-specific adaptations-intake tuning in the DS4 and exhaust routing in the C4 Picasso-and from 2013 the revised timing chain system improved reliability, creating service part differentiation. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the exhaust manifold (PSA TIS EP608). The 8th VIN digit indicates engine type ('T' for EP6DT). Pre-2013 models have a black cam cover with PSA logo; post-2013 units retain the same appearance but feature an updated tensioner. Critical differentiation from EP3: EP6DT has a turbocharged 12-valve head, while EP3 is a naturally aspirated 8-valve design. Service parts require model year verification—timing chain kits for pre-2013 engines are not interchangeable with later units due to internal redesign (PSA TSB 10-10-06).
The EP6DT's primary reliability risk is timing chain tensioner failure on early builds, with elevated incidence in urban stop-start driving cycles. PSA internal reports from 2014 indicated a notable number of pre-2013 engines required tensioner replacement before 120,000 km, while VCA records show neglected inspections as a leading cause of chain-related engine noise. Short-trip usage and delayed maintenance amplify wear, making oil quality and inspection 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 EP6DT.
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