The Peugeot XU5S is a 1,580 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a cast-iron block, aluminum head, and single overhead camshaft (SOHC) with two valves per cylinder, delivering 72 kW (98 PS) and 130 Nm of torque. Its robust construction and simple valvetrain design prioritized durability and ease of maintenance for its era.
Fitted primarily to the Peugeot 205 GTI 1.6 and 309 GTI 1.6, the XU5S was engineered for spirited, responsive handling in hot hatch applications. Emissions compliance was achieved through Bosch L-Jetronic fuel injection and a three-way catalytic converter, allowing compliance with Euro 1 standards upon its introduction.
One documented characteristic is potential for premature wear of the camshaft and rocker arms, addressed in Peugeot's Technical Note 88AX07. This issue was linked to initial lubrication design and material specifications, leading to a service campaign for affected early-production engines.
All production years 1986–1992 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/7890).
The Peugeot XU5S is a 1,580 cc inline‑four naturally aspirated petrol engineered for performance hatchbacks (1986-1992). It combines Bosch L-Jetronic fuel injection with a robust SOHC design to deliver responsive, linear power delivery. Designed to meet Euro 1 standards, it balances mechanical simplicity with the performance demands of its platform.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,580 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.5 mm × 82.0 mm | |
| Power output | 72 kW (98 PS) | |
| Torque | 130 Nm @ 4,000 rpm | |
| Fuel system | Bosch L-Jetronic multi-point injection | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt‑driven | |
| Oil type | API SF/CC (SAE 10W‑40) | |
| Dry weight | 112 kg |
The SOHC design offers straightforward, linear power ideal for spirited driving but requires strict adherence to 60,000 km timing belt replacement intervals to prevent catastrophic failure. Early production engines may exhibit camshaft lobe wear; inspecting and replacing the cam and rockers per PSA Technical Note 88AX07 is advised for high-mileage units. The Bosch L-Jetronic system demands clean fuel and functioning sensors for optimal performance. Regular valve clearance checks (every 30,000 km) are critical for maintaining efficiency and preventing valve train noise.
Oil Specs: Original specification: API SF/CC (10W-40) (PSA Owner's Manual 1988). Modern equivalent: ACEA A3/B3 10W-40.
Emissions: Euro 1 certification applies to all model years 1986-1992 (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under DIN 70020 standards. Peak output requires 95 RON fuel minimum (PSA TIS Doc. A57000).
PSA Technical Information System (TIS): Docs A56789, A56790, SIB 88 01 07
VCA Type Approval Database (VCA/EMS/7890)
Deutsches Institut für Normung: DIN 70020 Engine Power Certification Standards
The Peugeot XU5S was used across PSA Group's hot hatch platforms with transverse mounting. This engine shared its core architecture with the XU5J but featured higher compression and revised camshaft profiles for the GTI models. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface on the front of the block, just below the exhaust manifold (PSA TIS A56795). The 8th VIN digit typically indicates engine type ('S' for XU5S). Visually, the XU5S is identifiable by its black valve cover with "1600 Injection" script and the Bosch L-Jetronic air flow meter on the intake. Critical differentiation from the XU5J: The XU5S has a higher-lift camshaft and different ECU mapping for increased power.
The XU5S's primary documented concern is premature camshaft and rocker arm wear, with elevated incidence in high-revving or poorly maintained engines. PSA service data from 1989 indicated a notable number of early-build engines required cam replacement before 80,000 km, while owner club surveys confirm diligent oil changes mitigate this risk. High-RPM use and infrequent oil changes accelerate wear, making adherence to maintenance schedules critical.
Analysis derived from PSA technical bulletins (1986-1992) and owner club maintenance surveys (1995-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT 171-XU5S.
Comprehensive technical documentation and regulatory references
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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)
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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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