The Nissan RB20DE is a 1,998 cc, inline‑six petrol engine produced between 1985 and 1998. It features a cast iron block, aluminium cylinder head, DOHC valvetrain with 24 valves total, and electronic fuel injection. This naturally aspirated powerplant delivered 103–110 kW (140–150 PS) and 179–186 Nm of torque, engineered for smooth, linear power delivery and refined operation.
Fitted to models such as the Skyline (R31/R32), Laurel (C32/C33), and Cefiro (A31), the RB20…
Production years 1985–1998 meet applicable emissions standards for their respective model years and markets (VCA UK Type Approval records for relevant chassis codes).
The Nissan RB20DE is a 1,998 cc inline-six petrol engine engineered for mid-size sedans and coupes (1985-1998). It combines dual overhead camshafts with electronic multi-point fuel injection to deliver smooth, linear power and refined operation. Designed to meet the emissions standards of its production era, it prioritizes mechanical durability and a broad, usable powerband.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, DOHC, 4 valves per cylinder | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.0 mm × 69.7 mm | |
Power output | 103–110 kW (140–150 PS) @ 6,400 rpm | |
Torque | 179–186 Nm @ 4,800 rpm | |
Fuel system | Electronic multi-point fuel injection (Nissan ECCS) | |
Emissions standard | Applicable standards for model year (e.g., Japanese 1983, US Federal) | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven (single primary chain) | |
Oil type | API SF/SG, SAE 10W-30 or 10W-40 | |
Dry weight | 175 kg |
The Nissan RB20DE was used across Nissan's R31/C32/A31 platforms with longitudinal mounting. This engine received minor ECU and ignition system updates over its lifespan, but core mechanical components remained consistent, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
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The RB20DE's primary reliability risk is age-related failure of ignition components, with elevated incidence in high-mileage vehicles. Nissan technical bulletins document updates to the ignition system for improved durability, while owner reports frequently cite coil pack and sensor failures. Regular inspection and using quality replacement parts make maintaining smooth operation critical.
Analysis derived from Nissan technical bulletins (1985-1998) and aggregated owner-reported failure data (1995-2023). 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
Yes, the RB20DE is known for its exceptional mechanical durability and longevity. Its cast iron block and simple, robust design are very reliable. The main long-term concerns are age-related failures of ignition components (coils, sensors) and coolant system parts. With regular maintenance, these engines can easily exceed 400,000 km.
The most frequent issues are ignition coil pack failures, crank angle sensor (CAS) failures causing no-start conditions, coolant leaks from hoses or the water pump, and intake manifold gasket leaks. These are common wear items on any high-mileage engine and are generally straightforward to repair.
The RB20DE was used in the Nissan Skyline (R31 & R32), Laurel (C32 & C33), and Cefiro (A31) from 1985 to 1998. It was the standard non-turbo inline-six for these platforms during its production run, prized for its smoothness and reliability.
Yes, moderately. Basic bolt-ons like a performance air filter, free-flow exhaust, and ECU chip can yield 10-20 kW. More significant power requires internal modifications or forced induction (converting to RB20DET specs). Its strength is smooth power delivery and reliability, not peak horsepower.
Fuel economy is moderate for its era and configuration. Expect approximately 11-13 L/100km (18-21 mpg UK) in city driving and 8-10 L/100km (24-29 mpg UK) on the highway, depending on the vehicle and driving conditions. The inline-six design prioritizes smoothness over ultimate efficiency.
No. The Nissan RB20DE is a non-interference engine. This means if the timing chain were to fail or jump, the pistons will not contact the valves. While a broken chain will still stop the engine, it prevents catastrophic internal damage, making it very forgiving.
Nissan originally specified API SF or SG grade oil, typically in 10W-30 or 10W-40 viscosity. Modern high-quality conventional or synthetic oils meeting API SN (or higher) in the same viscosity grades are perfectly suitable. Change intervals should be every 5,000-10,000 km.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
NISSAN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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