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 hig…
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 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.
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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The RGZ can be reliable long-term if meticulously maintained. The critical factors are using premium fuel (RON 98), replacing the timing belt every 80,000 km, and maintaining the boost control system (hoses, actuator). Neglecting these can lead to expensive detonation damage or catastrophic timing belt failure.
The most common issues are boost control system failures (vacuum leaks, wastegate actuator), timing belt failure due to neglected replacement, turbocharger oil seal leaks causing blue smoke, and intercooler pipe leaks. These are well-documented in Peugeot service information.
The RGZ engine was used in the Peugeot 405 Mi16 Turbo (1996-1997) and the Peugeot 406 Coupé 2.0 Turbo 16V (1997-2001). It was the top-tier performance engine for these models, producing 200 PS. It was not fitted to any other Peugeot models.
Yes, the RGZ responds very well to tuning. Common stage 1 modifications include a performance exhaust, air filter, and ECU remap, yielding gains of 20-30 kW. More advanced tuning involves a larger turbocharger, upgraded intercooler, and fuel system upgrades. The bottom end is robust, but ensure the engine is in good health before tuning.
Fuel economy is poor for its era, as expected for a high-performance turbocharged engine. In a Peugeot 406 Coupé, expect around 13.5 L/100km in the city and 8.5 L/100km on the highway, translating to roughly 21 mpg UK combined. Actual figures depend heavily on driving style.
Yes. The RGZ is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing significant and expensive internal engine damage. This makes adhering to the 80,000 km belt replacement schedule absolutely critical.
Peugeot mandates an oil meeting the ACEA A3 specification. A 10W-40 viscosity is recommended. Using a high-quality, fully synthetic oil that meets this spec is crucial for protecting the turbocharger and ensuring engine longevity, especially given the engine's performance orientation.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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