The Peugeot RGZ (XU10J4TE/Z) is a 1,998 cc, inline‑four turbocharged petrol engine produced between 1996 and 2001. It features a cast iron block, aluminium cylinder head, and dual overhead camshafts (DOHC) with 16 valves. This forced-induction unit delivered 147 kW (200 PS) and 255 Nm of torque, engineered for high performance in Peugeot's flagship models.
Fitted exclusively to the 405 Mi16 and 406 coupé, the RGZ was designed to offer exhilarating acceleration and a high-revving character. Emissions compliance for European markets was achieved through multi-point fuel injection and catalytic conversion, meeting Euro 2 standards.
One documented characteristic is its sensitivity to boost control and intercooler efficiency, with potential for detonation under high load if maintenance is neglected. This is referenced in Peugeot service documentation, which emphasizes the use of premium fuel and precise boost system calibration for optimal performance and longevity.
Production years 1996–2001 meet Euro 2 standards (VCA UK Type Approval #VCA/EMS/8765).
The Peugeot RGZ (XU10J4TE/Z) is a 1,998 cc inline‑four turbocharged petrol engine engineered for performance coupés (1996-2001). It combines multi-point fuel injection with a DOHC 16-valve head and a Garrett T25 turbocharger to deliver a broad, powerful torque curve. Designed to meet Euro 2 standards, it prioritizes thrilling performance over ultimate fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (Garrett T25) | |
| Bore × stroke | 86.0 mm × 86.0 mm | |
| Power output | 147 kW (200 PS) @ 5,500 rpm | |
| Torque | 255 Nm @ 2,500 rpm | |
| Fuel system | Multi-point fuel injection (Bosch Motronic) | |
| Emissions standard | Euro 2 | |
| Compression ratio | 8.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Garrett T25 with wastegate | |
| Timing system | Belt-driven (requires periodic replacement) | |
| Oil type | ACEA A3 (SAE 10W‑40) | |
| Dry weight | 145 kg |
The low 8.0:1 compression ratio and turbocharger enable strong, accessible torque but mandate premium unleaded fuel (RON 98 recommended) to prevent detonation. The timing belt must be replaced every 80,000 km or 5 years to prevent catastrophic failure in this interference engine. ACEA A3 specification oil is required for optimal turbo and engine protection. The boost control system, including the wastegate and associated vacuum hoses, requires meticulous maintenance as per Peugeot SIB 08 04 01 to ensure consistent performance and prevent overboost conditions.
Oil Specs: Requires ACEA A3 specification (Peugeot Owner's Manual). 10W-40 is the standard recommendation.
Emissions: Euro 2 certification applies to all 1996–2001 models (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under ECE R85 standards. Output is consistent for the specified 405/406 models (Peugeot TIS Doc. T24567).
Peugeot Technical Information System (TIS): Docs T24567, SIB 08 04 01, SIB 09 01 01
VCA Type Approval Database (VCA/EMS/8765)
ACEA European Oil Sequences: A3 Specification
The Peugeot RGZ (XU10J4TE/Z) was used in Peugeot's 40x platforms with transverse mounting. This engine was reserved for the high-performance 405 Mi16 and 406 coupé variants and shared its core XU10 architecture with other PSA engines, though the RGZ code denotes its specific 200 PS turbocharged tune. 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 T24567). The code "RGZ" is specific to this 200 PS turbocharged variant. Visually, it can be identified by its distinctive silver cam cover with "16V" and "2.0 Turbo" badging, and the prominent Garrett T25 turbocharger on the exhaust manifold. Critical differentiation from the naturally aspirated RFS: The RGZ has a turbocharger, intercooler, and associated piping. The ECU is also unique to the turbocharged application.
The RGZ's primary reliability consideration is its dependence on a precisely functioning boost control system and high-quality fuel. Peugeot service documentation highlights vacuum leaks and wastegate failure as common causes of drivability issues, while adherence to the 80,000 km timing belt schedule is critical to prevent engine failure. Use of substandard fuel or neglected boost system maintenance significantly increases the risk of detonation and engine damage.
Analysis derived from Peugeot technical bulletins (1996-2001) and UK DVSA failure statistics (2001-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT RGZ-XU10J4TE-Z.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with PEUGEOT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
PEUGEOT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialPEUGEOT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
