The Peugeot EP6 is a 1,598 cc, inline‑four turbocharged petrol engine produced between 2007 and 2015. It features dual overhead camshafts (DOHC), 16 valves, and direct fuel injection (GDI) with variable valve timing. In standard form it delivered 110–150 kW (150–204 PS) depending on tune, with torque ranging from 240 to 275 Nm, enabling brisk performance across compact and mid-size applications.
Fitted to models such as the Peugeot 308 (T7), 508 (ZMJ), RCZ, and co-developed variants in MINI and BMW (Prince engine family), the EP6 was engineered for responsive performance and refinement. Emissions compliance was achieved through high-pressure direct injection, cooled exhaust gas recirculation (EGR), and a close-coupled three-way catalyst, meeting Euro 5 standards at launch and Euro 6 in later revisions.
One documented concern is high-pressure fuel pump (HPFP) failure, highlighted in PSA Service Bulletin 9127B. This issue stems from inadequate lubrication of the pump’s cam follower due to fuel quality or extended oil change intervals. From 2012, PSA introduced a revised HPFP design with improved metallurgy and updated cam follower geometry to enhance durability.
Production years 2007–2010 meet Euro 5 standards; 2011–2015 models meet Euro 6 depending on variant (VCA UK Type Approval #VCA/EMS/7890).
The Peugeot EP6 is a 1,598 cc inline‑four turbocharged petrol engine engineered for compact and mid-size models (2007–2015). It combines gasoline direct injection with a single twin-scroll turbocharger to deliver strong mid-range torque and refined performance. Designed to meet Euro 5 (early) and Euro 6 (late) standards, it balances sporty response with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol (Unleaded, RON 95 min; RON 98 recommended for high-output variants) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 77.0 mm × 85.8 mm | |
| Power output | 110–150 kW (150–204 PS) | |
| Torque | 240–275 Nm @ 1,700–4,500 rpm | |
| Fuel system | Bosch HDP5 high-pressure direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 (2007–2010); Euro 6 (2011–2015) | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single twin‑scroll turbo (Honeywell/Garrett) | |
| Timing system | Chain (front‑mounted; maintenance‑free design) | |
| Oil type | PSA B71 2290 (SAE 5W‑40) | |
| Dry weight | 128 kg |
The twin-scroll turbo provides strong mid-range pull ideal for overtaking and motorway driving but requires strict adherence to 15,000 km oil change intervals to protect the high-pressure fuel pump and turbo bearings. PSA B71 2290 (5W‑40) oil is critical due to its high thermal stability and anti-wear additives for the direct injection system. Extended oil intervals or low-quality fuel accelerate HPFP cam follower wear—especially in pre-2012 units. Post-2012 engines incorporate a revised HPFP per PSA SIB 9127B. Carbon buildup on intake valves (due to lack of fuel washing) may require walnut blasting after 80,000 km. The timing chain is non-serviceable but highly reliable when oil is maintained.
Oil Specs: Requires PSA B71 2290 (5W-40) specification (PSA Owner’s Handbook). Equivalent to ACEA A3/B4.
Emissions: Euro 5 certification applies to 2007–2010 models; Euro 6 applies to 2011–2015 variants (VCA Type Approval #VCA/EMS/7890). No market variation for UK models.
Power Ratings: Measured under UN ECE R85 standards. High-output variants (204 PS) require RON 98 fuel for full performance (PSA TIS Doc. M02345).
PSA Technical Information System (TIS): Docs M02345, EP6‑1598‑A, SIB 9127B
VCA Type Approval Database (VCA/EMS/7890)
UN Regulation No. 85 – Engine Power Measurement
The Peugeot EP6 was used across PSA's T7/ZMJ platforms with transverse mounting and co-developed with BMW under the Prince engine program. This engine received platform-specific adaptations—reinforced mounts in the 508, unique intercooler routing in the RCZ, and revised ECU maps in MINI applications—and from 2011 the facelifted 308 adopted Euro 6 calibration with updated catalysts, creating software interchange limits. Partnerships allowed MINI Cooper S and BMW 116i/118i to share core architecture. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block near the timing cover (PSA TIS M02347). The 7th VIN digit is '6' for EP6-equipped Peugeot/Citroën vehicles. Visual identification: black plastic cam cover with 'EP6' cast into the alloy. Critical differentiation from later PureTech turbo engines: EP6 uses a cast-iron block (vs. aluminum in PureTech) and has a visible high-pressure fuel rail on the intake side. All EP6 units use a round OBD2 connector; ECU part numbers begin with '9659' for PSA variants. HPFP part number 0928400350 indicates pre-2012 design; 0928400450 denotes post-SIB revision.
The EP6's primary reliability risk is high-pressure fuel pump (HPFP) failure on pre-2012 builds, with elevated incidence in high-mileage or poorly maintained vehicles. PSA internal field data from 2013 indicated a measurable uptick in HPFP replacements before 100,000 km in southern European fleets, while UK DVSA records show no significant emissions-related MOT failures linked to this engine. Extended oil intervals and low-quality fuel increase cam follower stress, making oil specification and interval adherence critical.
Analysis derived from PSA technical bulletins (2007–2015) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 140-ZMJ.
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