The Land Rover Range Rover IV (facelift, L405) Long 3.0 D300, produced from July 2020 to October 2021, represents a sophisticated iteration of the iconic luxury SUV. This variant, positioned as a high-end offering within the fourth-generation Range Rover lineup, combines a potent 3.0-liter inline-six diesel engine with mild-hybrid technology and a long wheelbase for enhanced passenger comfort. It was primarily marketed in Europe, the Middle East, and other regions where large, luxury SUVs with diesel powertrains remained popular. The “D300” designation signifies its power output, approximately 301 horsepower, and the “Mild Hybrid” indicates the inclusion of a 48-volt electrical system to aid efficiency and performance.
Technical Specifications
| Brand | Land Rover |
| Model | Range Rover |
| Generation | Range Rover IV (facelift 2017) Long |
| Type (Engine) | 3.0 D300 (301 Hp) Mild Hybrid AWD Automatic |
| Start of production | July, 2020 |
| End of production | October, 2021 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption at Low speed (WLTP) | 14.8-15.2 l/100 km (15.9 – 15.5 US mpg) |
| Fuel consumption at Medium speed (WLTP) | 8.5-8.9 l/100 km (27.7 – 26.4 US mpg) |
| Fuel consumption at high speed (WLTP) | 7.6-8.2 l/100 km (30.9 – 28.7 US mpg) |
| Fuel consumption at very high speed (WLTP) | 9.1-9.8 l/100 km (25.8 – 24 US mpg) |
| Combined fuel consumption (WLTP) | 9.3-9.8 l/100 km (25.3 – 24 US mpg) |
| CO2 emissions (WLTP) | 243-258 g/km |
| Fuel consumption (economy) – urban (NEDC) | 11.5-11.6 l/100 km (20.5 – 20.3 US mpg) |
| Fuel consumption (economy) – extra urban (NEDC) | 6.4-6.6 l/100 km (36.8 – 35.6 US mpg) |
| Fuel consumption (economy) – combined (NEDC) | 8.3-8.4 l/100 km (28.3 – 28 US mpg) |
| CO2 emissions (NEDC) | 218-223 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.8 sec |
| Acceleration 0 – 62 mph | 7.8 sec |
| Acceleration 0 – 60 mph | 7.4 sec |
| Maximum speed | 209 km/h (129.87 mph) |
| Emission standard | Euro 6d-TEMP-EVAP-ISC |
| Weight-to-power ratio | 8.1 kg/Hp |
| Weight-to-torque ratio | 3.8 kg/Nm |
| Power | 301 Hp @ 4000 rpm |
| Torque | 650 Nm @ 1500-2500 rpm (479.42 lb.-ft.) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Ingenium / DT306 |
| Engine displacement | 2997 cm3 (182.89 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 83.01 mm (3.27 in.) |
| Piston Stroke | 92.33 mm (3.64 in.) |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Coolant capacity | 8.93 l (9.44 US qt | 7.86 UK qt) |
| Kerb Weight | 2443 kg (5385.89 lbs.) |
| Max. weight | 3210 kg (7076.84 lbs.) |
| Max load | 767 kg (1690.95 lbs.) |
| Trunk (boot) space – minimum | 900 l (31.78 cu. ft.) |
| Trunk (boot) space – maximum | 2470 l (87.23 cu. ft.) |
| Fuel tank capacity | 86 l (22.72 US gal | 18.92 UK gal) |
| Max. roof load | 100 kg (220.46 lbs.) |
| Permitted trailer load with brakes (12%) | 3500 kg (7716.18 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 150 kg (330.69 lbs.) |
| Length | 5200 mm (204.72 in.) |
| Width with mirrors folded | 2073 mm (81.61 in.) |
| Width including mirrors | 2220 mm (87.4 in.) |
| Height | 1868 mm (73.54 in.) |
| Wheelbase | 3122 mm (122.91 in.) |
| Front track | 1693 mm (66.65 in.) |
| Rear track | 1685 mm (66.34 in.) |
| Ride height (ground clearance) | 220-297 mm (8.66 – 11.69 in.) |
| Minimum turning circle | 13.4 m (43.96 ft.) |
| Approach angle | 25.5-34.7° |
| Departure angle | 24.5-29.0° |
| Ramp-over angle | 20.0-25.6° |
| Wading depth | 900 mm (35.43 in.) |
| Drivetrain Architecture | All wheel drive (4×4) with MHEV |
| Number of gears | 8 |
| Type of gearbox | Automatic transmission |
| Front brakes | Ventilated discs, 363 mm |
| Rear brakes | Ventilated discs, 350 mm |
Powertrain & Engine Architecture
The heart of the Range Rover D300 is Land Rover’s Ingenium engine family, specifically the DT306, a 2.997-liter inline-six cylinder diesel. This engine utilizes a sophisticated diesel commonrail fuel injection system, delivering precise fuel metering for optimal combustion. The engine boasts a high compression ratio of 15.5:1, contributing to its efficiency and power output. The mild-hybrid system incorporates a 48-volt electric motor that assists the engine during acceleration and allows for smoother start-stop operation, reducing emissions and improving fuel economy. The engine produces 650 Nm (479.42 lb-ft) of torque between 1500 and 2500 rpm, providing strong pulling power across a wide rev range. The engine is longitudinally mounted in the front of the vehicle, and power is transmitted to all four wheels via an eight-speed automatic transmission.
Driving Characteristics
The D300 powertrain delivers a refined and capable driving experience. The mild-hybrid system effectively mitigates turbo lag, resulting in responsive acceleration. While not as overtly sporty as some of the higher-powered Range Rover variants, the D300 offers ample power for effortless cruising and confident overtaking. The eight-speed automatic transmission provides smooth and seamless gear changes, contributing to a comfortable ride. The long wheelbase of this variant enhances ride quality, absorbing bumps and imperfections in the road. Compared to the more powerful petrol engines, the D300 prioritizes fuel efficiency and torque delivery, making it well-suited for long-distance journeys and towing. The automatic transmission is tuned for comfort and efficiency, with gear ratios optimized for relaxed cruising rather than aggressive acceleration.
Equipment & Trim Levels
The Range Rover IV (facelift) Long D300 typically came well-equipped as standard. Features included leather upholstery, heated and ventilated front seats, a premium sound system, a touchscreen infotainment system with navigation, and a comprehensive suite of safety features. The long wheelbase provided increased rear legroom, enhancing passenger comfort. Optional extras included a panoramic sunroof, upgraded leather trim, rear-seat entertainment systems, and advanced driver-assistance technologies such as adaptive cruise control and a 360-degree camera system. Trim levels varied by market, but generally offered increasing levels of luxury and technology.
Chassis & Braking
The Range Rover IV utilizes a robust aluminum monocoque chassis, providing a strong and lightweight foundation. The suspension system features air suspension with electronic dampers, allowing for adjustable ride height and damping rates. This system provides a comfortable ride on-road and enhances off-road capability. The D300 variant typically featured ventilated disc brakes on all four wheels, providing ample stopping power. The braking system is assisted by ABS (Anti-lock Braking System) and electronic stability control. Stabilizer bars are fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The Range Rover IV (facelift) Long D300 was generally well-received by automotive critics. It was praised for its luxurious interior, comfortable ride, and refined powertrain. The mild-hybrid system was seen as a positive step towards improving fuel efficiency and reducing emissions. Compared to the petrol-powered Range Rovers, the D300 offered better fuel economy and a more relaxed driving experience. However, some critics noted that the diesel engine lacked the outright performance of the higher-powered petrol variants. Against competitors like the BMW X7 and Mercedes-Benz GLS, the Range Rover D300 stood out for its off-road capability and distinctive British styling.
Legacy
The Ingenium diesel engine family has proven to be relatively reliable, although some early versions experienced issues with the diesel particulate filter (DPF). The D300 variant, being a later iteration of the engine, benefits from improvements made throughout the Ingenium’s development. On the used car market, the Range Rover IV (facelift) Long D300 represents a compelling option for buyers seeking a luxurious and capable SUV with good fuel economy. Regular maintenance, including timely servicing and DPF regeneration, is crucial for ensuring the long-term reliability of this powertrain. The combination of luxury, capability, and relative efficiency has ensured its continued desirability in the premium SUV segment.
