The Nissan Cedric diesel stands as a unique chapter in executive sedan history, blending traditional Japanese luxury car appointments with durable compression-ignition power plants. Built across multiple generations to serve both corporate fleets and private buyers looking for torque and longevity, the diesel-powered Cedric variants—most notably utilizing the legendary RD28 inline-six engine—offered a distinct driving character compared to their petrol V6 counterparts. While it wasn't built for raw speed, it delivered exceptional cruising comfort and mechanical simplicity that still attracts classic car enthusiasts today.
Understanding the appeal of this executive cruiser requires looking past standard horsepower figures. This review breaks down the specific diesel power plants, generation-by-generation evolution, real-world driving dynamics, and common maintenance realities you'll face if you're importing or maintaining one today.
Evolution of the Nissan Cedric Diesel Lineage
Nissan introduced diesel engines to the Cedric lineup to satisfy commercial operators, taxi companies, and long-distance drivers who demanded lower running costs and massive durability. The journey evolved from utilitarian four-cylinder units into refined inline-six power plants that matched the plush cabin environment of trims like the Brougham and Gran Turismo.
Early Diesel Foundations and the Shift to Inline-Sixes
Before the inline-six configuration became the standard for Cedric diesels, earlier iterations utilized heavy-duty four-cylinder blocks aimed primarily at commercial service. However, the introduction of the 2.8-liter RD28 inline-six engine changed the dynamic completely. It brought smoother operation, reduced cabin vibration, and better sustained highway speeds—key requirements for a flagship executive sedan competing directly with the Toyota Crown.
The Y31 and Y33 Generations
The Y31 generation cemented the Cedric diesel's reputation as a dependable highway cruiser. Fitted with the naturally aspirated RD28, it produced roughly 94 to 100 horsepower depending on the exact year and market tuning. Power delivery was linear rather than explosive, designed to pull smoothly from low RPMs.
By the time the Y33 generation arrived in the mid-1990s, the Cedric diesel continued to rely on the refined RD28 architecture. Even as petrol models adopted complex multi-valve V6 turbo setups, the diesel variant maintained its simple, mechanical focus, appealing to drivers who prioritized fuel range and durability over acceleration.
Core Technical Specifications
Comparing the diesel variants to their petrol siblings highlights the distinct engineering compromise. The focus shifted entirely from high-revving output to low-end torque delivery and long-term endurance.
- Engine Configuration: 2.8-liter (2,825 cc) inline-six, single overhead cam (SOHC)
- Aspiration: Naturally aspirated (IDI - indirect injection via precombustion chambers)
- Power Output: 94–100 hp at 4,800 rpm
- Torque: 176–178 Nm (approx. 131 lb-ft) at 2,400 rpm
- Transmission: 4-speed automatic or 5-speed manual (depending on production year and commercial vs. passenger spec)
- Drivetrain: Front-engine, rear-wheel drive (RWD)
The indirect injection system meant these engines operated with a distinct diesel hum at idle, though Nissan's extensive sound deadening in the Brougham trims kept cabin noise remarkably low for its era.
Real-World Performance and Driving Dynamics
Driving a diesel Cedric requires adjusting your expectations. Weighing nearly 1,500 kilograms, the chassis is pushed to its limits by a naturally aspirated 100-horsepower engine.
Acceleration is unhurried. Expect a zero-to-sixty sprint to take roughly 16 to 17 seconds. Merging onto fast-moving modern highways requires planning and patience. However, once the car reaches cruising speed, it settles into a comfortable rhythm. The suspension—typically featuring independent front struts and a robust rear link setup—absorbs road imperfections smoothly, creating a floating ride quality characteristic of 1990s Japanese luxury sedans.
Fuel economy serves as the primary reward. Real-world figures typically hover around 12.9 liters per 100 kilometers (roughly 18–22 MPG), which is respectable for a heavy, traditional rear-wheel-drive sedan from this period.
Maintenance Realities and Common Issues
Maintaining an older Japanese diesel sedan outside of its home market comes with distinct challenges and advantages. The mechanical simplicity of the RD28 engine means fewer electronic failure points than its computerized petrol counterparts, but age-related wear requires attention.
- Cooling System Sensitivity: The RD28 is sensitive to overheating. A failing radiator, old thermostat, or degraded water pump can quickly lead to cracked cylinder heads. Upgrading or thoroughly flushing the cooling system is often the first task prudent owners undertake.
- Glow Plug and Starting Reliability: Cold weather starts depend heavily on a healthy set of glow plugs and a strong electrical relay. If the car struggles to start on chilly mornings, testing the pre-heating circuit is the logical starting point.
- Parts Availability: While routine service items like filters are shared across various Nissan commercial applications, specific trim pieces, body panels, and interior components for the Cedric can be difficult to source outside of specialist JDM importers.
Frequently Asked Questions
Is the Nissan Cedric diesel good for daily driving today?
It handles modern daily commuting adequately if your commute doesn't rely heavily on rapid passing maneuvers. Its slow acceleration and vintage emissions profile mean it works best as a relaxed weekend cruiser or a unique car-show participant.
How does the RD28 diesel compare to Nissan's petrol V6 engines?
The petrol V6 options—such as the VG and VQ series—offer significantly faster acceleration, smoother high-speed passing power, and easier access to replacement parts. The diesel trades performance for lower fuel consumption and a unique mechanical charm.
Are parts difficult to find for these engines?
Basic engine components overlap with other Nissan commercial vehicles sold globally, but chassis-specific components require sourcing from Japanese Yahoo Auctions or specialized export parts suppliers.
Can the RD28 diesel be tuned for more power?
Because it relies on a naturally aspirated indirect injection layout, extracting significant power gains is difficult and expensive. Attempting to force heavy turbocharging onto a non-turbo block often compromises long-term reliability.
