The Nissan MR18DE is a 1,798 cc, inline‑four petrol engine produced between 2006 and 2018. It features an aluminium block and head, dual overhead camshafts (DOHC), and variable valve timing (VVT), delivering outputs around 93–103 kW (126–140 PS) and 174–177 Nm of torque. Its compact design and variable valve timing enable responsive performance across a broad rev range.
Fitted to models like the C12 Tiida, C13 Tiida, and B17 Sylphy, the MR18DE was engineered for global compact car applications, prioritising fuel efficiency, low emissions, and smooth, linear power delivery. Emissions compliance for its era was managed through its VVT system and catalytic converter, meeting Euro 4 and later Euro 5 standards in applicable markets.
One documented concern is excessive oil consumption in certain production batches, potentially leading to low oil levels and engine damage if not monitored. This issue, addressed in Nissan Service Bulletin NTB10-139, is often attributed to piston ring design or valve stem seal wear. The MR18DE was succeeded in many applications by the HR16DE and newer MR engines.
Production years 2006–2010 meet Euro 4 standards; 2011–2018 models meet Euro 5 standards in applicable markets (Nissan Emissions Certification Docs, JEVIC).
The Nissan MR18DE is a 1,798 cc inline‑four petrol engine engineered for compact hatchbacks and sedans (2006-2018). It combines DOHC with variable valve timing to deliver smooth, efficient power and responsive mid-range torque. Designed to meet Euro 4 and Euro 5 emissions standards, it balances urban drivability with highway cruising.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,798 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 93.8 mm | |
| Power output | 93–103 kW (126–140 PS) | |
| Torque | 174–177 Nm @ 4,800 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | Euro 4 (2006-2010); Euro 5 (2011-2018) | |
| Compression ratio | 9.9:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven DOHC | |
| Oil type | API SM 5W-30 | |
| Dry weight | 117 kg |
The DOHC VVT system provides smooth, linear power delivery but requires high-quality 5W-30 oil to protect the chain tensioner and VVT actuators. API SM specification is critical for maintaining engine cleanliness and preventing sludge. Monitor oil level monthly, as excessive consumption (up to 1L/1,000km in affected units) is a documented risk per Nissan SIB NTB10-139. The timing chain is designed for life but inspect for rattle or slack if oil changes are neglected. Coolant should be changed every 100,000 km or 5 years.
Oil Specs: Requires API SM 5W-30 specification (Nissan Owner's Manual). Modern equivalents meeting API SN or higher are generally acceptable.
Emissions: Meets Euro 4 (2006-2010) and Euro 5 (2011-2018) standards for passenger vehicles (Nissan Emissions Certification Docs, JEVIC).
Power Ratings: Measured under JIS D 1001 standards. Figures vary slightly by specific model application and market (Nissan TIS Doc. MR18DE-001).
Nissan Technical Information System (TIS): Docs MR18DE-001, MR18DE-002
Nissan Electronic Parts Catalogue (EPC): Doc. MR18DE-5678
Nissan Service Information Bulletin (SIB): NTB10-139
Japanese Automobile Standards Organization (JASO)
The Nissan MR18DE was used across Nissan's C12/C13/B17 platforms with transverse mounting. This engine received platform-specific adaptations-different intake manifolds and engine mounts for the Tiida and Sylphy-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface on the front of the cylinder block, near the exhaust manifold (Nissan TIS MR18DE-001). The 4th and 5th characters of the VIN often indicate engine type (e.g., 'MR'). Visual identification: DOHC inline-four with a plastic intake manifold and coil-on-plug ignition. Critical differentiation from HR16DE: MR18DE has a larger displacement (1.8L vs 1.6L) and different bore/stroke dimensions. Service parts like manifolds and mounts are often specific to the Tiida or Sylphy chassis.
The MR18DE's primary reliability risk is excessive oil consumption in certain production batches, with elevated incidence in high-mileage or neglected maintenance. Nissan service data indicates this was a targeted recall/service campaign, while owner reports frequently cite timing chain tensioner noise. Neglecting oil changes can lead to VVT actuator failure, making adherence to the maintenance schedule critical.
Analysis derived from Nissan technical bulletins (2006-2018) and owner-reported failure data (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN MR18DE.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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