The Renault S8U 758 is a 1,995 cc, inline‑four turbo‑diesel engine produced between 2018 and 2023. It features a high-pressure common‑rail fuel system, variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). In standard form it delivers 110 kW (150 PS) and 340 Nm of torque, engineered for responsive low‑rpm performance and compliance with Euro 6d emissions.
Fitted to models such as the Kadjar, Talisman, and Espace—including the dCi 150 variants—the S8U 758 was engineered for refined everyday driving with strong pulling power and low fuel consumption. Emissions compliance was achieved through cooled exhaust gas recirculation (EGR), a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) with AdBlue injection, meeting Euro 6d standards.
One documented concern is premature AdBlue injector clogging, highlighted in Renault Service Bulletin RSB‑EMI‑2021‑08. This issue stems from crystallisation of urea deposits during frequent short trips or cold climates, leading to NOx system faults and reduced power. Renault issued revised injector hardware and updated ECU calibration from Q3 2021 to mitigate recurrence.
All production years 2018–2023 meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/8765).
The Renault S8U 758 is a 1,995 cc inline‑four turbo‑diesel engineered for mid‑size SUVs and sedans (2018–2023). It combines high-pressure common‑rail injection with a variable‑geometry turbocharger to deliver strong low‑rpm torque and refined cruising. Designed to meet Euro 6d standards, it balances performance with stringent emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 110 kW (150 PS) | |
| Torque | 340 Nm @ 1,750 rpm | |
| Fuel system | Bosch CP4.2 common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (Garrett) | |
| Timing system | Chain (front‑mounted) | |
| Oil type | Renault RN0720 (ACEA C2/C3, SAE 5W‑30) | |
| Dry weight | 165 kg |
The S8U 758 delivers smooth low-end torque ideal for urban and motorway use but requires adherence to 20,000 km or 12-month oil change intervals using RN0720-spec oil to protect the high-pressure fuel pump and turbo. AdBlue system reliability depends on trip length—frequent short journeys increase crystallisation risk in the injector. Bosch CP4.2 pumps demand ultra-low-sulfur diesel (EN 590) to avoid premature wear. EGR and DPF regeneration cycles are automatic but may be interrupted by city driving, necessitating occasional highway runs. Post-2021 models include updated AdBlue injectors per RSB‑EMI‑2021‑08.
Oil Specs: Requires Renault RN0720 (5W‑30, ACEA C2/C3) specification (Renault SIB RSB‑LUBE‑2019‑11).
Emissions: Euro 6d certification applies to all 2018–2023 models (VCA Type Approval #VCA/EMS/8765).
Power Ratings: Measured under UN ECE R85 standards. Output verified on RDE-compliant test cycles (Renault TIS Doc. M8U‑4510).
Renault Technical Information System (TIS): Docs M8U‑4501, M8U‑4502, M8U‑4503, RSB‑EMI‑2021‑08
VCA Type Approval Database (VCA/EMS/8765)
UNECE Regulation No. 85 (Engine Power Measurement)
The Renault S8U 758 was used across Renault's CMF‑CD platform with transverse mounting. This engine received platform-specific adaptations—reinforced mounts in the Espace and revised cooling ducts in the Kadjar—and from 2021 the Talisman facelift adopted updated AdBlue hardware, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the alternator bracket (Renault TIS M8U‑4550). The 7th VIN digit indicates engine family ('8' for S8U series). All S8U 758 units feature a black plastic valve cover with “dCi 150” branding and an AdBlue tank integrated into the spare wheel well. Critical differentiation from earlier M9R engines: S8U uses a front-mounted chain and SCR aftertreatment with a dedicated AdBlue injector. Service parts require production date verification—AdBlue injectors before 09/2021 are incompatible with post-bulletin calibrations (Renault RSB‑EMI‑2021‑08).
The S8U 758's primary reliability risk is AdBlue injector clogging due to urea crystallisation, with elevated incidence in urban/short-trip usage. Renault internal field data from 2021 indicated a measurable uptick in NOx system faults before 50,000 km in high-idle duty cycles, while UK DVSA records show related emissions warnings in RDE-tested vehicles. Cold climates and infrequent highway driving amplify deposit formation, making system maintenance and driving pattern awareness critical.
Analysis derived from Renault technical bulletins (2019–2023) and UK DVSA failure statistics (2020–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about RENAULT S8U-758.
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