The Isuzu MU-X RF20, specifically the facelifted model produced from February 2017 to October 2020, represents Isuzu’s entry into the mid-size SUV market, primarily targeted towards families and those requiring a robust, capable vehicle. This variant, equipped with the 3.0-liter turbocharged diesel engine producing 177 horsepower and paired with a six-speed automatic transmission and four-wheel drive, was a significant offering in markets like Australia, Thailand, and South Africa, where body-on-frame SUVs remain popular. It served as a more premium alternative to pickup-based SUVs, offering a more refined driving experience and a greater focus on passenger comfort.
Technical Specifications
| Brand | Isuzu |
| Model | MU-X |
| Generation | MU-X (RF20) (facelift 2017) |
| Type (Engine) | 3.0d (177 Hp) 4×4 Automatic |
| Start of production | February, 2017 |
| End of production | October, 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 9.5-9.9 l/100 km (24.8 – 23.8 US mpg) |
| Fuel consumption (extra urban) | 6.8-7.1 l/100 km (34.6 – 33.1 US mpg) |
| Fuel consumption (combined) | 7.9-8.1 l/100 km (29.8 – 29 US mpg) |
| CO2 emissions | 208-214 g/km |
| Fuel Type | Diesel |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 11.8 kg/Hp |
| Weight-to-torque ratio | 4.9 kg/Nm |
| Power | 177 Hp @ 3600 rpm |
| Torque | 430 Nm @ 2000-2200 rpm (317.15 lb.-ft. @ 2000-2200 rpm) |
| Engine Model/Code | 4JJ1-TC |
| Engine displacement | 2999 cm3 (183.01 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 95.4 mm (3.76 in.) |
| Piston Stroke | 104.9 mm (4.13 in.) |
| Compression ratio | 16.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 6.9 l (7.29 US qt | 6.07 UK qt) |
| Coolant capacity | 11.1 l (11.73 US qt | 9.77 UK qt) |
| Kerb Weight | 2092-2157 kg (4612.07 – 4755.37 lbs.) |
| Max. weight | 2750 kg (6062.71 lbs.) |
| Max load | 593-658 kg (1307.34 – 1450.64 lbs.) |
| Trunk (boot) space – minimum | 235 l (8.3 cu. ft.) |
| Trunk (boot) space – maximum | 1830 l (64.63 cu. ft.) |
| Fuel tank capacity | 65 l (17.17 US gal | 14.3 UK gal) |
| Permitted trailer load with brakes (12%) | 3000 kg (6613.87 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4825 mm (189.96 in.) |
| Width | 1860 mm (73.23 in.) |
| Height | 1825-1860 mm (71.85 – 73.23 in.) |
| Wheelbase | 2845 mm (112.01 in.) |
| Front track | 1570 mm (61.81 in.) |
| Rear track | 1570 mm (61.81 in.) |
| Front overhang | 905 mm (35.63 in.) |
| Rear overhang | 1075 mm (42.32 in.) |
| Ride height (ground clearance) | 220-230 mm (8.66 – 9.06 in.) |
| Minimum turning circle | 11.6 m (38.06 ft.) |
| Approach angle | 23.3-24.0° |
| Departure angle | 24.6-25.1° |
| Ramp-over angle | 18.7-19.5° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission Rev-Tronic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/70 R16; 255/60 R18 |
| Wheel rims size | 7J x 16; 7J x 18 |
Powertrain & Engine Architecture
The heart of this MU-X variant is the Isuzu 4JJ1-TC 3.0-liter inline-four cylinder diesel engine. This engine is a robust and well-regarded unit, known for its durability and relatively simple construction. It features a cast iron block and aluminum cylinder head, contributing to its longevity. The ‘TC’ designation indicates the presence of a turbocharger with an intercooler, boosting power and torque output. The engine utilizes a common rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The 4JJ1-TC employs a double overhead camshaft (DOHC) valvetrain with four valves per cylinder, enhancing breathing and overall efficiency. The six-speed automatic transmission, branded ‘Rev-Tronic’ by Isuzu, was chosen for its smooth operation and suitability for both on-road and off-road driving. It’s a conventional torque converter automatic, prioritizing reliability over outright performance.
Driving Characteristics
The 177 horsepower and 430 Nm (317 lb-ft) of torque delivered by the 3.0-liter diesel and automatic transmission combination provide adequate, but not exhilarating, performance. Acceleration is linear and predictable, making it well-suited for towing and hauling. The automatic transmission is programmed for comfort, with smooth shifts and a tendency to prioritize fuel economy over aggressive downshifts. Compared to the manual transmission versions of the same engine, the automatic sacrifices some responsiveness. Higher-output versions of the 4JJ1-TC, found in some markets, offer significantly more power and a sportier driving experience. However, this configuration prioritizes usability and ease of driving, making it ideal for everyday commuting and family transport. The four-wheel drive system provides enhanced traction in challenging conditions, making it a capable off-roader.
Equipment & Trim Levels
The MU-X RF20 facelift typically came standard with features like air conditioning, power windows, power mirrors, a basic audio system with Bluetooth connectivity, and a multi-function steering wheel. Higher trim levels added features such as leather upholstery, automatic climate control, a touchscreen infotainment system with navigation, and rear parking sensors. Safety features included ABS brakes, dual front airbags, and stability control. Optional extras often included a sunroof, roof rails, and upgraded audio systems.
Chassis & Braking
The MU-X utilizes a traditional body-on-frame construction, providing a robust and durable platform. The front suspension consists of a double wishbone setup, while the rear features an independent multi-link suspension. This configuration aims to balance ride comfort with handling stability. Braking duties are handled by ventilated discs at the front and solid discs at the rear. The braking system is assisted by ABS (Anti-lock Braking System) to prevent wheel lockup during emergency stops.
Market Reception & Comparison
The Isuzu MU-X 3.0d 4×4 Automatic was generally well-received in its target markets. Critics praised its robust build quality, comfortable ride, and spacious interior. However, some noted that the engine, while durable, lacked the refinement and power of some competitors. Fuel economy was considered reasonable for a vehicle of its size and type. Compared to other trims in the MU-X lineup, this variant offered a good balance between performance, fuel efficiency, and price. It positioned itself as a practical and reliable choice for families and those needing a capable SUV.
Legacy
The Isuzu 4JJ1-TC engine has proven to be exceptionally reliable, with many examples exceeding high mileage with minimal issues, provided regular maintenance is performed. The Rev-Tronic automatic transmission is also generally considered durable. In the used car market, the MU-X RF20 3.0d 4×4 Automatic holds its value reasonably well, particularly well-maintained examples. It remains a popular choice for those seeking a dependable and capable SUV at a competitive price point. Its reputation for reliability and practicality ensures its continued presence on roads for years to come.
