The Citroën RHX (engine code DW10BTED4) is a 1,997 cc, inline-four turbo-diesel engine produced between 2008 and 2018. It features a cast-iron block, aluminium head, and common-rail direct injection, delivering 103 kW (140 PS) at 4,000 rpm and 340 Nm of torque at 2,000 rpm. With a variable geometry turbocharger (VGT), DOHC valvetrain, and exhaust gas recirculation (EGR), it was engineered for strong mid-range performance and fuel efficiency in larger vehicles.
Fitted to models such as the Citroën C5, C6, and Peugeot 508, the DW10BTED4 was designed for executive comfort and long-distance cruising. Emissions compliance was achieved through a diesel particulate filter (DPF), closed-loop lambda control, and cooled EGR, enabling Euro 5 compliance across its production run. The engine’s smooth power delivery and low noise levels made it ideal for premium-oriented PSA models.
One documented concern is high-pressure fuel pump (HPFP) failure due to internal wear, particularly in vehicles with extended service intervals. This issue, highlighted in PSA Service Bulletin SIB-ENG-2013-06, is linked to inadequate lubrication and prolonged use of non-compliant diesel fuel. From 2012, PSA introduced revised HPFP calibration and updated fuel filter specifications to improve system longevity.
Production years 2008–2018 meet Euro 5 standards; certain export variants comply with Euro 6 depending on market (VCA UK Type Approval #VCA/EMS/7520).
The Citroën DW10BTED4 is a 1,997 cc inline-four turbo-diesel engine engineered for executive sedans and large hatchbacks (2008–2018). It combines common-rail injection with a variable geometry turbocharger to deliver robust torque and refined performance. Designed to meet Euro 5 standards, it balances power with emissions compliance in sustained highway driving.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (VGT) | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 103 kW (140 PS) @ 4,000 rpm | |
| Torque | 340 Nm @ 2,000 rpm | |
| Fuel system | Common-rail direct injection (Delphi HDP6, up to 1,800 bar) | |
| Emissions standard | Euro 5 (2008–2018) | |
| Compression ratio | 16.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Variable geometry turbo (IHI RHF5) | |
| Timing system | Timing belt (DOHC, front-mounted) | |
| Oil type | Total Rubia TIR 5W-30 (PSA B71 2310) | |
| Dry weight | 168 kg |
The VGT turbo provides strong low-RPM torque ideal for overtaking and towing but requires adherence to 120,000 km or 6-year timing belt replacement intervals to prevent valve damage. Total Rubia TIR 5W-30 oil meeting PSA B71 2310 specification is essential for maintaining EGR and DPF system health. The Delphi HDP6 high-pressure fuel pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent premature wear. Extended idling and urban driving inhibit DPF regeneration; highway runs every few hundred kilometres are recommended. Post-2012 models feature improved HPFP durability; pre-2012 units benefit from proactive filter changes per PSA SIB-ENG-2013-06.
Oil Specs: Requires PSA B71 2310 specification (PSA SIB-ENG-2013-06). Compatible with ACEA C3 but not a substitute.
Emissions: Euro 5 applies to 2008–2018 models (VCA Type Approval #VCA/EMS/7520). Some export variants meet Euro 6 depending on market.
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel grades meeting EN 590 diesel specification.
PSA Technical Information System (TIS): Docs P20500, P20600, SIB-ENG-2013-06
VCA Type Approval Database (VCA/EMS/7520)
ISO 1585:1992 Road vehicles — Test code for net power
The Citroën RHX (DW10BTED4) was used across Citroën's C/D platforms with transverse mounting and shared with Peugeot under PSA Group standardization. This engine received platform-specific calibrations—tuned idle control in the C6 and revised intake tuning in the C5—and from 2012, Euro 5-compliant variants featured updated ECU mapping and DPF regeneration logic, 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 P20500). The 8th VIN digit indicates engine type ('L' for DW10BTED4). Pre-2012 models have a silver valve cover with black plastic timing cover; post-2012 units use a black valve cover. Critical differentiation from DW10ATED4: DW10BTED4 has 340 Nm torque output, while DW10ATED4 (110 PS) uses lower-boost turbo. Service parts require model-year verification—fuel pumps and ECUs for pre-2012 engines are not interchangeable with post-revision units due to calibration changes (PSA SIB-ENG-2013-06).
The DW10BTED4's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in vehicles using non-EN 590 diesel. PSA internal field reports from 2014 indicated a significant share of pre-2012 units required HPFP replacement before 150,000 km, while UK DVSA data shows increased fuel system-related MOT failures in older examples. Extended service intervals and poor fuel quality exacerbate wear, making proactive maintenance critical.
Analysis derived from PSA technical bulletins (2010–2016) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CITROEN RHX-DW10BTED4.
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