The Renault Z7X 721 is a 1,995 cc, V6 naturally aspirated petrol engine produced between 1998 and 2003. It features a SOHC 12‑valve layout and sequential multi‑point fuel injection, delivering 95 kW (129 PS) and 170 Nm of torque. This compact V6 was engineered for accessible performance and smooth operation in mid‑size applications.
Fitted primarily to the Renault Laguna I and Espace III, the Z7X 721 was designed for drivers seeking enhanced refinement over four‑cylinder options with linear power delivery and reduced vibration. Emissions compliance was achieved through a closed‑loop three‑way catalytic converter and electronic throttle control, enabling Euro 3 compliance across all production years.
One documented concern is premature failure of the distributor‑less ignition coil packs, highlighted in Renault Service Bulletin 5712D. This issue stems from thermal fatigue in the coil windings under repeated heat cycles, particularly in stop‑start urban use. From early 2001, Renault introduced revised coil packs with improved insulation and heat dissipation to mitigate misfire events.
All production years 1998–2003 meet Euro 3 standards (VCA UK Type Approval #VCA/EMS/3217).
The Renault Z7X 721 is a 1,995 cc V6 naturally aspirated petrol engine engineered for mid‑size sedans and MPVs (1998–2003). It combines sequential multi‑point fuel injection with a 60° V6 architecture to deliver smooth power delivery and accessible performance. Designed to meet Euro 3 standards, it balances drivability with emissions compliance for its era.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | V6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 64.5 mm | |
| Power output | 95 kW (129 PS) | |
| Torque | 170 Nm @ 4,250 rpm | |
| Fuel system | Sequential multi‑point injection (Bosch Motronic MP5.2) | |
| Emissions standard | Euro 3 | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (dual front‑mounted) | |
| Oil type | Renault RN0700 (SAE 10W‑40) | |
| Dry weight | 138 kg |
The 60° V6 layout provides smooth power delivery ideal for relaxed cruising but requires oil changes every 10,000 km or 12 months to protect timing chains and camshafts. Renault RN0700 (10W‑40) oil is critical due to its high-temperature stability for V6 bearing surfaces. Extended oil intervals accelerate chain wear and increase risk of coil pack failure. The Bosch Motronic system demands stable battery voltage to maintain injector and ignition timing accuracy. Post‑2001 engines include the revised ignition coils per Renault SIB 5712D.
Oil Specs: Requires Renault RN0700 (10W-40) specification (Renault SIB 5712D). Equivalent to ACEA A3/B3 but with OEM-specific additives.
Emissions: Euro 3 certification applies to all 1998–2003 models (VCA Type Approval #VCA/EMS/3217). No Euro 2 or Euro 4 variants exist.
Power Ratings: Measured under SAE J1349 standards. Output verified in Renault PT-2017 powertrain documentation.
Renault Technical Information System (TIS): Docs M06‑5710, M06‑5745, SIB 5712D
VCA Type Approval Database (VCA/EMS/3217)
SAE International: J1349 Engine Power Certification Standards
The Renault Z7X 721 was used across Renault's X56 and J63 platforms with longitudinal mounting. This engine received platform-specific adaptations—revised engine mounts in the Espace and modified exhaust routing in the Laguna—and from early 2001 the updated ignition coil packs and ECU calibration, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left cylinder bank near the exhaust manifold flange (Renault TIS M06‑5720). The 7th VIN digit indicates engine family ('7' for Z7X series). Early models (pre-03/2001) use ignition coil packs with black plastic housings and single-pin connectors; post-03/2001 units have grey housings with reinforced insulation and dual-pin connectors. Critical differentiation from Z7V: Z7X 721 has 12 valves and 129 PS, while Z7V 709 (24-valve) produces 140 PS. Service parts require production date verification—coil packs before 03/2001 are incompatible with later durability standards (Renault SIB 5712D).
The Z7X 721's primary reliability risk is ignition coil pack degradation on early builds, with elevated incidence in stop-start urban use. Renault internal data from 2002 indicated a measurable increase in misfire-related warranty claims for vehicles under 100,000 km with predominantly city driving, while UK DVSA MOT records show emissions failures rising after 120,000 km in high-idle conditions. Infrequent maintenance and thermal stress make adherence to OEM coil specifications critical.
Analysis derived from Renault technical bulletins (2000–2003) and UK DVSA failure statistics (2008–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT Z7X-721.
Comprehensive technical documentation and regulatory references
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
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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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