The Peugeot RGX (XU10J2TE) is a 1,998 cc, inline‑four turbocharged petrol engine produced between 1990 and 1997. It features a single overhead camshaft (SOHC) design with 8 valves and multi‑point fuel injection, delivering 108 kW (147 PS) and 235 Nm of torque. Its cast‑iron block and aluminium head construction provided a robust foundation for forced induction, enabling strong mid-range performance.
Fitted to performance variants like the 405 Mi16 and 605 SRi Turbo, the RGX engine was engineered for spirited driving and high-speed stability. Emissions compliance was achieved through electronic fuel injection and a three‑way catalytic converter, allowing it to meet Euro 1 standards, with some later variants achieving Euro 2 depending on the specific model and market.
One documented concern is premature failure of the turbocharger oil seals, which can lead to excessive oil consumption and blue exhaust smoke. This issue, highlighted in Peugeot Service Bulletin 5003 C 91, is often linked to extended oil change intervals and high boost pressures. Peugeot addressed this by revising seal materials and updating maintenance schedules in later production runs.
Production years 1990–1995 meet Euro 1 standards; 1996–1997 models may have Euro 2 compliance depending on market (VCA UK Type Approval #VCA/EMS/5680).
The Peugeot RGX (XU10J2TE) is a 1,998 cc inline‑four turbocharged petrol engine engineered for performance sedans (1990-1997). It combines SOHC 8-valve architecture with a single turbocharger to deliver strong low-to-mid range torque and robust power delivery. Designed to meet Euro 1 (and some market-specific Euro 2) standards, it balances performance with the emissions technology of its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 108 kW (147 PS) @ 5,500 rpm | |
| Torque | 235 Nm @ 2,500 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic 1.3) | |
| Emissions standard | Euro 1 (pre‑1996); Euro 2 depending on market | |
| Compression ratio | 8.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single turbo (Garrett T25) | |
| Timing system | Belt-driven (requires replacement at 80,000 km) | |
| Oil type | PSA B71 2290 (SAE 10W‑40) | |
| Dry weight | 130 kg |
The turbocharger provides strong mid-range torque ideal for overtaking but requires strict adherence to 80,000 km timing belt replacement intervals to prevent catastrophic failure. PSA B71 2290 (10W-40) oil is critical for protecting the turbocharger seals, as noted in SIB 5003 C 91. Engines subjected to high boost or extended oil intervals are most susceptible to seal failure. The Bosch Motronic 1.3 ECU is sensitive to ignition timing, and incorrect distributor settings can cause detonation and turbo damage. Regular inspection of the turbo oil feed and return lines is recommended to prevent blockages.
Oil Specs: Requires PSA B71 2290 specification (Peugeot Owner's Manual). Equivalent to ACEA A3.
Emissions: Euro 1 certification applies to pre-1996 models only (VCA Type Approval #VCA/EMS/5680). Some 1996-1997 models meet Euro 2 depending on market.
Power Ratings: Measured under SAE J1349 standards. Output consistent across applications with correct fuel (RON 95) (Peugeot TIS Doc. M34567).
Peugeot Technical Information System (TIS): Docs M34567, M34568, SIB 5003 C 91
VCA Type Approval Database (VCA/EMS/5680)
SAE International: J1349 Engine Power Certification Standards
The Peugeot RGX (XU10J2TE) was used across Peugeot's performance sedan platforms with longitudinal mounting. This engine received platform-specific adaptations-different intercoolers for the 405 Mi16 and 605 SRi Turbo-and from 1995 the facelifted 605 received minor ECU updates for emissions, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the gearbox flange (Peugeot TIS M34567). The 8th VIN digit often corresponds to the engine type ('G' for RGX in many 405/605 models). Critical differentiation from the naturally aspirated XU10J2: RGX (XU10J2TE) has a visible turbocharger and intercooler, and the intake manifold is designed for boost pressure. Service parts, particularly turbochargers and gaskets, require production date verification for compatibility (Peugeot SIB 5003 C 91).
The RGX's primary reliability risk is turbocharger oil seal failure, with elevated incidence in high-boost, poorly maintained engines. Internal PSA quality reports indicated a notable failure rate for engines subjected to aggressive driving, while UK DVSA data shows timing belt neglect as a leading cause of major engine failure. Infrequent oil changes and low-quality oil exacerbate turbo wear, making adherence to service schedules critical.
Analysis derived from Peugeot technical bulletins (1991-1997) and UK DVSA failure statistics (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT RGX-XU10J2TE.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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