The Peugeot SFY (4B12 — MMC) is a 2,360 cc, inline‑four naturally aspirated petrol engine produced between 2010 and 2017. It features double overhead camshafts (DOHC), 16 valves, and Mitsubishi's MIVEC variable valve timing system. In standard form, it delivered 125 kW (170 PS) and 226 Nm of torque, engineered for smooth, linear power delivery ideal for larger SUVs.
Fitted to the 4007 and 4008 models, the SFY engine was designed for refined, effortless cruising and compet…
Production years 2010–2017 meet Euro 5 standards .
The Peugeot SFY (4B12-MMC) is a 2,360 cc inline‑four naturally aspirated petrol engine engineered for compact SUVs (2010-2017). It combines DOHC 16-valve architecture with MIVEC variable valve timing to deliver smooth, predictable power. Designed to meet Euro 5 standards, it prioritizes refinement and reliability for daily driving.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,360 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 88.0 mm × 97.0 mm | |
Power output | 125 kW (170 PS) @ 6,000 rpm | |
Torque | 226 Nm @ 4,100 rpm | |
Fuel system | Sequential multi-point injection (Mitsubishi MPI) | |
Emissions standard | Euro 5 | |
Compression ratio | 10.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Mitsubishi DiaQueen 5W‑30 (API SM/ILSAC GF-4) | |
Dry weight | 145 kg |
The Peugeot SFY (4B12-MMC) was used exclusively in Peugeot's PF2 platform with transverse mounting, under a licensing agreement with Mitsubishi Motors. This engine received no major platform-specific adaptations or facelift revisions during its production run. All technical specifications are governed by Mitsubishi documentation.
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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 SFY is generally a robust and reliable engine if maintained correctly. The main concern is timing chain tensioner wear on pre-2013 models, which can be mitigated by using the specified 5W-30 oil and avoiding excessive high-RPM driving. With proper care, these engines can easily exceed 200,000 km.
The most documented issues are premature timing chain tensioner wear (early models), failing MIVEC solenoids causing rough running, malfunctioning IMRC actuators leading to power loss, and leaking valve cover gaskets. These are covered in Mitsubishi service bulletins.
The SFY engine was used exclusively in the Peugeot 4007 (2010-2012) and its successor, the 4008 (2012-2017). It was also shared with Citroën, appearing in the C-Crosser (2010-2012). It's a transverse-mounted engine for front-wheel-drive platforms, sourced directly from Mitsubishi.
Modest gains are possible. An ECU remap can yield around +10-15 kW by optimizing ignition and fuel maps. More significant power requires hardware like performance cams or intake, which is costly. It's better suited to reliability than aggressive tuning due to its naturally aspirated design.
Fuel economy is average for its size and era. In a Peugeot 4008 2.4i, expect around 10.5 L/100km in the city and 6.8 L/100km on the highway, averaging approximately 30-35 mpg UK combined. Real-world figures vary significantly with driving style.
Yes. The SFY is an interference engine. If the timing chain were to fail or jump, the pistons would collide with the open valves, causing catastrophic internal engine damage. Fortunately, the timing chain is very durable if the tensioner is functioning correctly and oil is changed regularly.
Mitsubishi mandates oil meeting their DiaQueen 5W-30 specification, which corresponds to API SM/ILSAC GF-4. Using the correct oil is paramount, especially to protect the timing chain tensioner. Always check the oil cap or owner's manual for the exact specification before topping up or changing.
Comprehensive technical documentation and regulatory references
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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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