The Citroën 5FW (EP6DT) is a 1,598 cc, inline-four turbocharged petrol engine produced between 2010 and 2018. It forms part of the PSA-Renault joint-engineering HFV (High Fuel Value) family, co-developed with Renault and used across multiple brands. Featuring direct fuel injection, variable valve timing (VVT), and twin-scroll turbocharging, it delivers responsive performance with moderate efficiency. In standard tune, it produces 115 kW (156 PS) and 240 Nm of torque.
Fitted to models such as the Citroën DS3, DS4, and DS5, as well as the Peugeot 207 GTi and 308 GTi, the EP6DT was engineered for spirited driving and sporty character. It balances high specific output with compact packaging for transverse front-wheel-drive layouts. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, meeting Euro 5 standards throughout its production run.
One documented concern is premature turbocharger bearing wear, highlighted in PSA Service Bulletin SIB-ENG-2014-07. This issue is often linked to extended oil change intervals and low oil levels, leading to lubrication starvation under high thermal load. From 2015, revised turbocharger hardware and updated oil service intervals were introduced to improve reliability in later production runs.
Production years 2010–2018 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Citroën 5FW (EP6DT) is a 1,598 cc inline-four turbocharged petrol engine engineered for compact and performance-oriented models (2010–2018). It combines direct fuel injection with a twin-scroll turbocharger to deliver strong mid-range torque and agile throttle response. Designed to meet Euro 5 standards, it balances sporty performance with moderate fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (Mitsubishi TD04HL-15T) | |
| 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 150 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi TD04HL-15T twin-scroll | |
| Timing system | Timing chain (integrated into cylinder block) | |
| Oil type | Total Quartz INEO ECS 5W-30 | |
| Dry weight | 123 kg |
The twin-scroll turbo provides strong low-end torque ideal for urban and spirited driving but requires strict adherence to 15,000 km oil change intervals to prevent turbo bearing wear and carbon buildup in injectors. Total Quartz INEO ECS 5W-30 oil is critical due to its low-SAPS formulation and thermal stability under high exhaust gas temperatures. Extended idling after high-load operation should be avoided to reduce coking in the turbocharger. Direct injectors are prone to intake valve coking; periodic walnut blasting is recommended. Post-2015 models feature revised turbo oil feed lines and updated ECU mapping for improved durability. Lambda sensors and catalytic converter longevity depend on consistent use of 95 RON or higher fuel.
Oil Specs: Requires Total Quartz INEO ECS 5W-30 specification (PSA SIB-ENG-2014-07). Supersedes ACEA C3.
Emissions: Euro 5 certification applies to all models (2010–2018) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards. Output requires 98 RON fuel for optimal performance (PSA TIS HFV-EP6-05).
PSA Technical Information System (TIS): Docs HFV-EP6-01, HFV-EP6-02, SIB-ENG-2014-07
VCA Type Approval Database (VCA/EMS/5678)
ISO 8854: Road vehicles — European emissions standards
The Citroën 5FW (EP6DT) was used across Citroën's DS series platforms with transverse mounting and shared with Peugeot and Renault under the HFV engine program. This engine received platform-specific calibrations-adapted throttle mapping in the DS3 Racing and revised intercooler routing in the DS5 Hybrid4-and from 2015 the updated EP6DTXS variant introduced higher boost and improved oil cooling, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (PSA TIS HFV-EP6-06). The 8th VIN digit indicates engine type ('B' for EP6DT). Pre-2015 models have a single intercooler mounted above the turbo; post-2015 EP6DTXS units feature a larger side-mounted intercooler. Critical differentiation: EP6DT uses a Mitsubishi TD04HL-15T turbo with cast iron manifold, while the later EP6CDT (dual turbo) uses a Garrett unit. Service parts require model-year verification—turbo oil lines and ECUs are not interchangeable between pre- and post-2015 builds (PSA SIB-ENG-2015-03).
The EP6DT's primary reliability risk is turbocharger bearing wear on early builds, with elevated incidence in high-performance or stop-start use. Internal PSA quality reports from 2014 indicated a significant number of pre-2015 units requiring turbo replacement before 100,000 km, while UK DVSA MOT records show increased catalytic converter failures in urban-driven examples. Short trips and delayed oil changes accelerate thermal degradation, making service adherence and oil quality critical.
Analysis derived from PSA technical bulletins (2012–2016) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN 5FW-EP6DT.
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